BMW G01 X3 / G02 X4 Semi-Closed Cold Air Intake with Metal Heat Shield Box Included (2018-2021) | X3 M40i, X4 M40i w/ 3.0L B58 Engine

Elevate the performance of your BMW X3 M40i or X4 M40i with our Semi-Closed Cold Air Intake System, engineered for the B58 3.0L turbocharged inline-six. This system strikes the perfect balance between an open-cone intake and a sealed airbox — giving you the raw airflow of an open design while shielding the filters from excess engine bay heat with a precision-fit metal heat shield box.

The stock intake on the B58-powered G01 X3 and G02 X4 was built for quiet comfort, not performance. By replacing it with this semi-closed intake, you free up airflow, reduce restriction, and let your turbos breathe cool, dense air consistently. The result:

1. Sharper throttle response
2. Improved turbo spool with less lag
3. Stronger midrange torque for daily driving and highway pulls
4. Horsepower gains that scale with tuning

The included metal heat shield box not only blocks radiant heat, but also keeps airflow directed toward the dual cone filter, maintaining efficiency during spirited driving or back-to-back runs. Unlike full closed-box systems that muffle sound, this design lets you fully experience the deep induction growl, crisp turbo spool, and satisfying blow-off acoustics the B58 is known for.

Combined with high-temp silicone couplers and reinforced clamps, this intake is built for reliability under boost, track days, and tuned applications. It’s not just an upgrade in performance — it’s a transformation of your driving experience.

Key Features

• Semi-closed design: open-cone airflow with added heat protection
• Metal heat shield box reduces heat soak & directs fresh air
• High-flow filter element designed for maximum surface area
• Sharper throttle response and stronger midrange torque
• Durable silicone couplers withstand boost & heat cycles
• Aggressive induction tone with pronounced turbo spool
• Direct OEM fitment for quick and secure installation

FITMENT: Designed for BMW models with the B58 3.0L turbo inline-six, including: G01 X3 M40i (2018–2021), G02 X4 M40i (2018–2021).

Engine Compatibility: B58B30O1 turbocharged inline-six

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