F30 F31 340i B58 catless downpipe 3.5in - stage 2, track day, fast road (Cobra Sport CS-DP-B58-35)

Direct-fit catless downpipe for F30 and F31 340i with B58 engine - no spacers, no flange mods, no compromises. Built for stage 2 tuning, track day use or fast-road aggression where flow and response matter more than emissions compliance.

• Exact fit: Designed for B58-powered F30/F31 340i (2017-2019 LCI), not N55 or G20
• 3.5in (88.9mm) mandrel-bent stainless: Larger than stock to reduce backpressure, improve spool and support higher boost
• Catless design: Removes the restrictive factory catalytic converter - required for decat mapping, not for MOT or daily driver use
• Includes gaskets and hardware: OEM-style V-band clamp, turbo outlet gasket, and flange gasket - no sourcing extras
• Search terms this matches: B58 decat downpipe, F30 340i stage 2 exhaust, F31 340i catless downpipe, B58 fast road downpipe, F30 track day exhaust, Cobra Sport CS-DP-B58-35