Fabspeed Secondary Bypass Downpipes for BMW G90 / G99 M5

Replace the matching M5 secondary catalyst section with uncatalyzed stainless pipes. This reference changes the secondary emissions hardware and does not supply the separate HJS primary catalyst assemblies. Fabspeed Motorsport designs performance exhaust systems, air intakes and ECU tuning in Fort Washington, Pennsylvania. Porsche and other sports-car applications are developed through dyno testing, road evaluation and racetrack work.

Technical Details

• Manufacturer product reference: FS.BMW.G90.SCB.
• Secondary catalyst-bypass pipes.
• T304L stainless tubing.
• Machined flanges and laser-cut brackets.
• For matching original exhaust interfaces.
• Confirm sensor and heat-protection requirements.
• Primary downpipes are separate.
• Not a complete cat-back or an approved unchanged road-car exhaust.

Use restrictions

Fabspeed specifies closed-track and off-road use only for this catalyst-replacement component and states it is not CARB- or EPA-certified for road use.

For help matching this component, contact PMB Performance with your VIN and photos or references for the component being replaced. Our team draws on over 20 years of parts and fitment experience.

Fitment & Compatibility

Use the application details below together with the original component and any existing modifications.