BMW B58 Downpipe (G Series) - Boosted Engineering

Increased power, improve turbo response and reduce exhaust backpressure with the Boosted Engineering B58 High Flow Downpipe.

Designed for BMW B58 applications, this upgrade improves exhaust flow and turbocharger efficiency while helping reduce exhaust gas temperatures under load. When paired with appropriate tuning, improved cruising efficiency and reduced fuel consumption may also be achieved under light throttle conditions.

Suitable for stock turbo and upgraded turbo applications.

Benefits

• Increased power and torque

• Improved turbo response and spool

• Reduced exhaust backpressure

• Lower exhaust gas temperatures

• Potential improvement in cruising fuel efficiency with tuning

• Enhanced exhaust sound

Construction

• High flow stainless steel design

• Precision TIG welded assembly

• Direct bolt-on fitment

Tuning Information

ECU calibration is strongly recommended following installation to maximise performance, drivability and reliability.

Compatibility

Suitable for selected BMW B58 applications including:

• M140i

• M240i

• 340i / 440i

• M340i / M440i

• X3 M40i

• X4 M40i

• X5 40i

• X6 40i

• Additional BMW B58 applications

Please confirm compatibility prior to purchase.

Important Information

This product is intended for high performance applications.

Professional installation is recommended.

The following are typically required to run this kit at intended output. Boosted Engineering can supply or advise on all of them.

• ECU tune (custom)Boosted Engineering supplies base map
• Upgraded fuel systemInjectors, fuel pump — spec varies with output
• Upgraded ignitionR35 coilpack conversion recommended
• Upgraded clutchTwin-plate for higher-power builds
• Oil cooler kitRecommended for sustained high-load use
• Upgraded axlesFor 350+ kW builds

The Street Kit is designed for daily-drivable turbo builds with reliable, responsive power delivery. The Race Kit is oriented toward circuit and drag use where higher output and modular servicing are priorities.

The kit is designed for bolt-on installation in a suitably-equipped workshop. Installation is available at our Carrara QLD workshop, or through our trusted partner network in most metropolitan areas.

Approximate installation time — 20 to 30 hours depending on configuration and supporting work.