BMW 135i N55 (E82/E88) primary cat replacement pipes, Milltek Sport

Direct-fit primary catalytic converter replacement pipes for the BMW 135i with N55 engine - E82 Coupe and E88 Cabriolet only. Made in the UK from mandrel-bent 304 stainless steel.

Designed for fast-road or track-day use: sharper throttle response, improved turbo spool and a deeper, more engaging exhaust note - zero cabin drone.

• No modifications needed; bolts straight onto the stock downpipe flange
• Not emissions-compliant - for off-road, track or motorsport use only
• Compatible with full Milltek exhaust systems or used standalone