The Hack Engineering S55 Catless Downpipes optimise exhaust flow by replacing the highly-restrictive factory catalytic converters, and also add much-needed aggression and depth to the S55’s sound. This is one of the best upgrades you can make to allow the S55 engine to truly perform in your F87 M2 Competition, F80 M3 (inc Competition) and F82/F83 M4 (inc Competition). Please note that as they replace the primary catalytic converters, these can result in MOT and emissions issues, and mapping to suit will be required to correct fuelling and avoid EML light.

These pipes bolt directly to the OEM system and use factory mounting locations. Not suitable for OPF models (July 2018 onwards) without an OPF delete.

• Made from hand-crafted, TIG-welded 4.5″ 304-grade stainless steel
• Fits LHD and RHD models with no other modifications needed
• CNC-machined turbo flanges for use with OE gaskets and clamps
• Direct fit with the stock exhaust as well as aftermarket systems
• Heat shielded for reduced engine bay temperatures and optimal performance

Please note that removal of emissions equipment is not MOT compliant and so these parts are for off-road use only.