BMW G30/G31/G38 5 Series Performance Exhaust Downpipe Set – High-Flow Design for Maximum Power | Fits G30 Sedan & G31 Touring 540i Models (2017–2020) – B58 3.0 L Turbo I6 Engine

Unleash the true personality of your BMW 540i with the BAVMODS® Performance Exhaust Downpipe Set — engineered to free the B58’s 3.0L turbo inline-six from the restrictive factory system that muffles both its sound and potential.

From the factory, the 540i’s exhaust flow is limited by dense catalytic converters that trap heat and restrict turbine efficiency. Our high-flow downpipe system replaces those bottlenecks with smooth, precision-bent stainless steel piping, allowing the turbocharger to spool faster and breathe freely. The result? Instant throttle response, stronger midrange torque, and an exhilarating, aggressive exhaust tone that perfectly matches the 540i’s soul.

Built from T304 stainless steel, each pipe is CNC-formed and TIG-welded by hand for maximum strength, perfect fitment, and long-lasting durability under high heat. The mandrel-bent design ensures a consistent inner diameter, eliminating turbulence and allowing exhaust gases to exit smoothly — optimizing velocity, pressure, and overall turbo performance.

This system bolts directly to your factory or aftermarket exhaust and includes OEM-compatible O₂ sensor ports, allowing for a seamless installation without cutting or modification. Whether paired with a stock tune or upgraded ECU flash, these downpipes transform the 540i’s driving experience — delivering sharper response, faster spool, and that deep, confident tone BMW enthusiasts crave.

Key Features

• High-Flow Design – Reduces backpressure and improves turbocharger efficiency
• Mandrel-Bent T304 Stainless Steel – Corrosion-resistant and designed for extreme heat conditions
• Precision TIG Welding – Strength and reliability for long-term performance
• OEM Sensor Compatibility – Pre-fitted O₂ bungs for easy plug-and-play installation
• Flex Joint Integration – Absorbs vibration and movement under boost pressure
• Aggressive Exhaust Note – Unlocks the B58’s rich, throaty tone
• Direct Bolt-On Fitment – Compatible with stock and aftermarket exhaust systems

Performance Benefits

• Faster turbo spool and enhanced throttle response
• Noticeable horsepower and torque gains
• Smoother midrange power delivery with reduced turbo lag
• Cooler exhaust gas temperatures under high load
• Distinctive, motorsport-inspired exhaust tone
• Lightweight construction with long-term reliability

FITMENT:

• BMW G30 5 Series Sedan (2017–2020)
• BMW G31 5 Series Touring (2017–2020)
• BMW G38 5 Series Long Wheel-Base Sedan (2017–2020 – China Market)

ENGINE COMPATIBILITY: B58B30 3.0L Turbocharged Inline-Six

NOTE: For off-road or competition use only. Professional installation is recommended to ensure proper sensor alignment and sealing. Pairing with an ECU tune is highly recommended to fully unlock performance potential and eliminate CEL codes.

Please refer to the “Fitment” section in the product description for compatibility details.