Description
The Milltek BMW G80/G81/G82 M3/M4 Secondary Catalyst Bypass Pipe – Non Resonated to OE Axle Back Only (SKU: SSXBM1339) is a high-performance aftermarket replacement part engineered for motorsport applications. This component is designed to replace the restrictive factory secondary catalytic converters, eliminating exhaust flow bottlenecks and dramatically improving gas flow efficiency. The bypass pipe is manufactured from premium-grade stainless steel in the UK to Milltek’s exacting quality standards, ensuring durability and precision fitment.
This product is non-resonated, meaning it does not include any sound dampening chambers, and it is intended to be used exclusively with the original equipment manufacturer (OEM) axle-back exhaust system for optimal compatibility and performance. By removing the secondary catalysts, the exhaust gases can exit more freely, which results in increased horsepower and torque, a more aggressive exhaust sound, and reduced turbo lag.
Milltek’s extensive research and development have created this bypass pipe specifically for the BMW M3 and M4 models equipped with the S58 3.0L turbocharged inline-6 engine, delivering a significant performance upgrade for motorsport enthusiasts who demand unrestricted exhaust flow and maximum power potential.
Detailed Fitment Information
This secondary catalyst bypass pipe is designed to fit the following BMW models and configurations:
- BMW 3 Series M3 (chassis codes G80 and G81) and M3 Competition, model years 2020 through present, powered by the S58 3.0L turbocharged inline-6 engine.
- BMW 4 Series M4 (chassis codes G82 and G22) and M4 Competition, model years 2020 through present, powered by the S58 3.0L turbocharged inline-6 engine.
- Fitment is explicitly for North American (NA) and Rest of World (ROW) markets where vehicles are equipped without the Otto Particulate Filter (OPF) or Gasoline Particulate Filter (GPF).
- This product is compatible only when used in combination with the OEM axle-back exhaust system; it is not intended for use with aftermarket axle-back or full exhaust systems.
- Designed for motorsport use only and is not EC approved for street or road use.
This fitment ensures the bypass pipe directly replaces the factory secondary catalytic converters in these specified models, providing a direct bolt-on upgrade with no modifications necessary.
