BMW F20 F21 M140i F22 F23 M240i F30 F31 340i Supersprint de-cat turbo downpipe 987310

Direct-fit de-cat turbo downpipe for B58-powered BMWs: F20/F21 M140i, F22/F23 M240i and F30/F31 340i. No cutting, no welding - bolt on and go.

• Stainless steel construction, built for track-day durability and fast-road responsiveness
• Threaded O2 bung included - ready for remap or standalone ECU use
• Reduces turbo back pressure for sharper throttle response and improved spool
• Not road legal - strictly for off-road, circuit or track-day use

Same part number as the catted version (987311), just without the catalyst. If your car’s already mapped and you’re chasing flow, this is the pragmatic upgrade.