{"product_id":"bmw-e46-323i-323ci-325i-325ci-325xi-328i-328ci-z3-upper-air-intake-boot-hose-m52tu-m54-mass-air-flow-sensor-rubber-coupling-replacement-replaces-part-no-13541705209","title":"BMW E46 323i\/323Ci\/325i\/325Ci\/325xi\/328i\/328Ci \u0026 Z3 Upper Air Intake Boot Hose – M52TU\/M54 Mass Air Flow Sensor Rubber Coupling Replacement | Replaces Part No. 13541705209","description":"\u003cp data-pm-slice=\"1 1 []\"\u003e\u003cstrong\u003e\u003cspan\u003eRestore the integrity of your BMW's engine air intake system with this replacement upper air intake boot hose, designed for select BMW E46 3 Series and Z3 models equipped with compatible M52TU and M54 inline-six engines. Located immediately after the mass airflow (MAF) sensor, this flexible rubber intake coupling connects the airflow meter outlet to the lower intake boot assembly, helping deliver measured intake air toward the engine's throttle body. Over time, the original rubber boot can deteriorate from engine heat, vibration, oil vapor, and repeated temperature changes, potentially developing cracks, splits, or loose connections that allow unmetered air into the intake system. Replacing a damaged upper intake boot can help restore proper airflow containment and eliminate vacuum leaks originating from this component.\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe upper air intake boot is an important part of the BMW E46 and Z3 engine intake system. It forms a sealed connection between the mass airflow sensor and the downstream intake ducting. Because the MAF sensor measures incoming air before it enters the boot, cracks or loose connections downstream of the sensor can introduce additional air that the engine management system has not measured.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUnmetered intake air can affect the engine's air-fuel mixture calculations and may contribute to rough idling, hesitation, unstable engine speed, lean mixture fault codes, or reduced drivability. Although these symptoms can have several causes, deteriorated rubber intake boots are a recognized source of intake air leaks on aging BMW M52TU and M54 engines.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe original upper intake boot is exposed to continuous engine compartment heat and vibration. Over time, the rubber may harden, lose flexibility, or develop cracks around its accordion-style sections and connection points. Damage may be difficult to identify without removing or flexing the boot, particularly when cracks develop along the underside of the component.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis replacement intake hose is designed around BMW original equipment reference number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e13541705209\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e. Its flexible rubber construction is intended to accommodate normal engine movement while maintaining the sealed airflow connection between the mass airflow sensor and the lower intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a cracked upper boot is a practical maintenance procedure that can be performed without modifying the engine management system. When properly fitted and secured, the replacement helps prevent unmetered air from entering through the upper intake connection and restores the intended airflow path.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor BMW owners maintaining an E46 323i, 325i, 328i, or compatible Z3, this upper air intake boot offers a straightforward replacement for an aging intake system component. It is particularly useful during intake leak diagnosis, preventive maintenance, or a broader intake system refurbishment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eKey Features\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"true\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUpper Air Intake Boot Replacement:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Designed to replace the upper intake coupling located immediately downstream of the mass airflow sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW OE Reference 13541705209:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Intended as an aftermarket replacement for the original BMW upper intake rubber boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eM52TU and M54 Engine Applications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits select BMW E46 and Z3 models using the corresponding factory intake system.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFlexible Rubber Construction:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Designed to accommodate normal engine movement and vibration while maintaining the intake air connection.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHelps Eliminate Intake Air Leaks:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Replacing a cracked or split boot can prevent unmetered air from entering through this section of the intake system.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSupports Accurate MAF-Based Airflow Management:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Helps preserve the sealed air path after the mass airflow sensor so the engine management system can calculate fuel delivery accurately.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFactory-Style Intake Connection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Designed to connect the MAF sensor outlet to the corresponding lower intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSuitable for Intake System Restoration:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Ideal for replacing hardened, brittle, cracked, or deteriorated original rubber intake components.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNo Electronic Programming Required:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Mechanical intake hose replacement does not require coding or software programming.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePractical Maintenance Replacement:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Suitable for vehicles experiencing verified upper intake boot leaks or undergoing intake system inspection and refurbishment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a deteriorated upper air intake boot helps restore the intended sealed airflow path between the MAF sensor and downstream intake components. When a leak is present at the original boot, replacement may improve idle stability and engine drivability by eliminating that specific source of unmetered air.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFITMENT: BMW E46 3 Series \u0026amp; BMW Z3\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 3 Series Sedan\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 323i – 1999–2000:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M52TU inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 325i – 2001–2005:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54 inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 325xi – 2001–2005:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54 inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 328i – 1999–2000:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.8L M52TU inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 3 Series Coupe\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 323Ci – 2000:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M52TU inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 325Ci – 2001–2006:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54 inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 328Ci – 2000:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.8L M52TU inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 3 Series Convertible\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 323Ci Convertible – 2000:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M52TU inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 325Ci Convertible – 2001–2006:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54 inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 3 Series Touring\/Wagon\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 323i Touring – Select 1999–2000 applications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M52TU\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 325i Touring – 2001–2005:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW 325xi Touring – 2001–2005:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 Roadster \u0026amp; Coupe\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 2.3 – Approximately 1999–2000:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M52TU inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 2.5i – Approximately 2001–2002:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.5L M54 inline-six\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 2.8 – Select applications:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e 2.8L M52-family inline-six, subject to production-date verification\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAdditional BMW Applications Requiring VIN Verification\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe original BMW part number is also cataloged for certain international-market E46 320i\/320Ci and Z3 2.0\/2.2i configurations. These applications should be confirmed against the original intake boot and vehicle VIN before inclusion in guaranteed fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant Fitment Information\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe part number \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e13541705209\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e identifies the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eupper intake boot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e used in selected M52TU\/M54 intake arrangements.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe listed vehicle model years represent commonly cataloged applications and do not guarantee fitment across every production date or engine configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eVerify the original part number and intake duct geometry before purchase.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eEngine Compatibility\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW M52TU Engines\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"true\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eM52TUB25 – 2.5L Inline-Six\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 323i\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 323Ci\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW Z3 2.3\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eM52TUB28 – 2.8L Inline-Six\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 328i\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 328Ci\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSelect BMW Z3 2.8 applications\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW M54 Engines\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eM54B25 – 2.5L Inline-Six\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 325i\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 325Ci\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 325xi\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW Z3 2.5i\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOther Engine Applications\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCertain M52TU\/M54 2.0L and 2.2L international-market vehicles may also use this OE boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEngine code and VIN verification are required before extending fitment.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNot Automatically Compatible\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 330i or 330Ci with M54B30\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 M3 with S54\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW E46 four-cylinder engines\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW diesel engines\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eBMW M56 SULEV intake configurations\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese vehicles may use different intake boots, diameters, connections, or air intake layouts.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eOEM Replacement Part Numbers\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003ePrimary BMW Reference\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"false\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e13541705209\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e13 54 1 705 209\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003e13-54-1-705-209\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cspan\u003eThese formats identify the same BMW part number.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eImportant Part Distinction\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis product is the \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003eupper air intake boot\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e, located directly after the MAF sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt is not the lower intake boot connecting toward the throttle body. The lower boot is a separate component and may have a different BMW part number depending on engine and vehicle configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDo not treat \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e13541435627\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e or \u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e13541438761\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e as interchangeable replacements for 13541705209 without checking their individual applications and positions.\u003c\/span\u003e\u003cstrong\u003e\u003cspan\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003col data-spread=\"false\" start=\"1\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePark the vehicle securely on a level surface.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSwitch off the ignition and allow the engine to cool.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eOpen the hood and locate the air filter housing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIdentify the mass airflow sensor and the upper intake boot connected to its outlet.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eConfirm the replacement boot matches the original component and BMW part number.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInspect the original boot for visible cracks, tears, hardened rubber, or loose connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIdentify any nearby electrical connectors or intake components that may restrict access.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCarefully loosen the hose clamp securing the upper boot to the MAF sensor outlet.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eLoosen the clamp connecting the upper boot to the downstream lower intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRemove or reposition surrounding intake components only as necessary.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eGently separate the original upper boot from the MAF sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDisconnect the downstream end of the boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eRemove the deteriorated upper intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInspect the MAF sensor outlet for damage or contamination.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInspect the downstream lower intake boot for cracking or deterioration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eClean the mating surfaces using an appropriate non-damaging method.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eCompare the replacement boot's shape, diameter, length, and connection points with the original.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePosition the new upper intake boot between the MAF sensor and lower intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eEnsure the boot is fully seated on both connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eConfirm that the boot is not twisted, stretched, or compressed incorrectly.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePosition the hose clamps behind the corresponding retaining lips.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eTighten the clamps securely without damaging the rubber or plastic fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReinstall any intake components removed for access.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eReconnect any electrical connectors that were disconnected.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eInspect the entire intake path for loose hoses or open connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eStart the engine and observe idle operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eListen for unusual intake hissing or other signs of an air leak.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eVerify that the boot remains securely attached during normal engine operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eIf the vehicle previously had lean mixture or intake-related faults, complete the appropriate diagnostic checks.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003ePerform a smoke test when necessary to confirm that no additional intake leaks remain.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInstallation Guidance\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe upper intake boot is positioned after the MAF sensor, so any opening in this section can allow unmetered air into the engine.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInspect the lower intake boot during replacement because both components can deteriorate with age.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDo not overtighten hose clamps against plastic MAF sensor connections.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA replacement intake boot does not require electronic programming, but stored fault codes may need to be evaluated after the underlying issue has been repaired.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eCompatibility Notes\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul data-spread=\"true\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUpper Intake Boot Only:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e BMW part number 13541705209 identifies the upper intake coupling located directly after the mass airflow sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNot the Lower Intake Boot:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The lower throttle-body intake boot is a separate component. Do not advertise this product as a complete upper-and-lower intake boot assembly.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 323i Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M52TU 2.5L configurations, primarily 1999–2000 North American models.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 323Ci Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M52TU 2.5L coupe and convertible configurations, subject to original part-number confirmation.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 325i Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M54B25 2.5L configurations, commonly 2001–2005.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 325Ci Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M54B25 2.5L configurations, including select 2006 coupe and convertible models.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 325xi Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M54B25 all-wheel-drive models using the corresponding intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 328i Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M52TU 2.8L configurations, primarily 1999–2000 North American models.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 328Ci Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Fits applicable M52TU 2.8L coupe configurations, primarily model year 2000.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 2.3 Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Applies to select Z3 2.3 models with the 2.5L M52TU engine. The 2.3 model designation does not indicate a 2.3L engine.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 2.5i Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Applies to select Z3 2.5i models with the M54B25 engine.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW Z3 2.8 Compatibility:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Production date and engine configuration matter. Verify the original part number, particularly on earlier vehicles.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eM52TU and M54 Are Different Engine Families:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The 323i\/328i applications generally use M52TU engines, while the listed 325i\/325Ci\/325xi applications use M54 engines. Do not describe all listed models as M54-powered.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 330i\/330Ci Exclusion:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Do not assume fitment on M54B30 3.0L applications. These models may use a different intake boot configuration.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW E46 M3 Exclusion:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The S54-powered E46 M3 uses a different intake arrangement and is not included.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eBMW M56 SULEV Exclusion:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Vehicles equipped with the M56 engine may use different intake components. Confirm the exact part before purchase.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eFour-Cylinder E46 Models:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Not included in the primary fitment list. Do not assume compatibility based solely on the E46 chassis.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDiesel E46 Models:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Not included. Diesel intake systems use different components and configurations.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eMAF Sensor Connection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The replacement must fit the original mass airflow sensor outlet correctly.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLower Boot Connection:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The downstream end must match the vehicle's corresponding lower intake boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAir Leak Symptoms:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e A cracked upper intake boot may contribute to rough idle, hesitation, unstable engine speed, lean mixture faults, or intake hissing.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eSymptoms Are Not Exclusive to This Part:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Similar problems can result from vacuum hoses, crankcase ventilation components, lower intake boots, fuel delivery issues, or other engine faults.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eUnmetered Air Concern:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Because this boot is downstream of the MAF sensor, cracks or loose connections can allow air to enter without being measured by the sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eInspect the Underside:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Cracks may develop on surfaces that are not visible while the boot is installed.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eRubber Aging:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Heat, oil vapor, vibration, and time can cause the original rubber to harden or split.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eHose Clamp Condition:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Inspect the existing clamps and replace damaged or corroded hardware when necessary.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eDo Not Overtighten:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Excessive clamp pressure can damage the boot or adjoining plastic fittings.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNo Performance Gain Guaranteed:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Replacing a damaged boot restores the intended intake connection; it does not independently increase engine horsepower or alter engine tuning.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNo MAF Sensor Included:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e This product does not replace the mass airflow sensor or repair an electronically defective MAF sensor.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNo Throttle Body Included:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e The throttle body is a separate component and is not part of this replacement boot.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNot a Cold Air Intake Kit:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e This product is a factory-style replacement coupling, not a complete aftermarket cold air intake system.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eNo Programming Required:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Mechanical replacement of the boot does not require ECU coding.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eAftermarket Replacement:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e This is an aftermarket intake hose and should not be represented as a Genuine BMW component.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eVIN Verification Recommended:\u003c\/span\u003e\u003c\/strong\u003e\u003cspan\u003e Confirm BMW part number 13541705209 against the vehicle's VIN, production date, and original intake system before ordering.\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eLong-Term Intake System Reliability\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe upper intake boot is an important sealing component in BMW M52TU and M54 engine intake systems. As the original rubber ages, cracking or deterioration can allow unmetered air to enter downstream of the mass airflow sensor, potentially affecting idle quality, fuel mixture control, and engine drivability.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eReplacing a damaged upper intake boot helps restore the intended airflow path between the MAF sensor and the lower intake assembly. When properly installed and secured, the replacement provides a sealed connection that supports normal engine management operation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFor BMW E46 323i, 325i, 328i, and compatible Z3 owners, inspecting the upper and lower intake boots is a practical part of maintaining an aging intake system. Replacing damaged components, checking nearby vacuum connections, and confirming that the intake system is free from leaks can help preserve smooth engine operation and dependable everyday drivability.\u003c\/span\u003e\u003c\/p\u003e","brand":"BAVMODS®","offers":[{"title":"Default Title","offer_id":49354854629566,"sku":null,"price":55.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0619\/8788\/1150\/files\/Screenshot2026-11-05at2.09.59PM.png?v=1793909592","url":"https:\/\/bavmods.com\/de\/products\/bmw-e46-323i-323ci-325i-325ci-325xi-328i-328ci-z3-upper-air-intake-boot-hose-m52tu-m54-mass-air-flow-sensor-rubber-coupling-replacement-replaces-part-no-13541705209","provider":"BAVMODS®","version":"1.0","type":"link"}