OneFastShop B58 Catless Downpipe 4.5 Inch BMW M240i M340i 440i 540i Supra A90 2016-2024

Wake up your B58 with the OneFastShop 4.5 inch catless downpipe. This is the single biggest bang for buck mod available for your M240i, M340i, 440i, or Toyota Supra A90. The factory cat is the largest restriction in your exhaust, and removing it unlocks the deep, aggressive growl your B58 was built to make.

Real World Performance Gains:

• +30 to +40 horsepower with proper tuning
• Even more power on upgraded turbo setups
• Significantly faster turbo spool and quicker throttle response
• Deeper, more aggressive exhaust note from the turbo outlet back
• Stage 2+ tune ready, supports big power builds

Features:

• Full 4.5 inch diameter mandrel bent tubing
• 304 grade stainless steel construction
• CNC machined billet flanges
• Hand TIG welded joints
• Welded mounting bracket included
• Integrated flex section to absorb engine movement and heat cycles
• Lifetime warranty on defects
• LHD and RHD compatibility
• Compatible with OEM and aftermarket cat back exhausts
• Direct bolt on installation, no cutting required

Technical Specs:

• Diameter: 4.5 inch (full diameter maintained from turbo outlet)
• Material: 304 grade stainless steel
• Tubing: Mandrel bent
• Flanges: CNC machined billet
• Welding: Hand TIG welded
• Mounting: Welded bracket included
• Flex section: Integrated
• Configuration: Race configuration, catalytic converter removed
• Engine: BMW B58 (F chassis, G chassis, and Supra A90)

Contents:

• 1 B58 4.5 inch catless downpipe

Gasket required for installation: A turbo to downpipe gasket is required to seal this downpipe to your factory turbo. Our 4.5 Inch Turbo to Downpipe Gasket for BMW B58 and Toyota Supra is available separately, add it to your order from our store.

Vehicle Fitment:

Important Note:

This product is intended for off-road and track use only. It is not legal for use on public roads and may not comply with emissions regulations. Check local laws before installation.