Competition Series 4" Catless Downpipe

The Evolution Racewerks Competition Series 4" Catless Downpipe is engineered to enhance exhaust flow for N20 four-cylinder turbo engines. This USA-made downpipe is constructed from 100% 304-grade stainless steel, featuring mandrel-bent 4" piping and 100% TIG welding for superior quality and durability. It directly replaces the factory catalytic converter, a significant restriction, to unleash more power. Installation of this downpipe can result in average horsepower gains of 14-16whp and torque gains of 16wtq at stock boost, potentially exceeding 24wtq with a software upgrade. Drivers can expect a higher and faster-hitting torque curve, improved throttle response, and faster turbo spool times, contributing to a more responsive driving experience. Key features include a precision CNC-machined turbocharger V-Band flange, a factory-style stainless steel flex section to prevent stress on exhaust components, and compatibility with both factory and aftermarket exhaust systems. Options for ceramic thermal coating to reduce underhood temperatures and additional O2 or EGT sensor bungs are also available. **Important Compatibility and Usage Notes:** This downpipe fits all 2012-2015 320i, 328i, 125i, 228i, 420i, and 428i models equipped with the N20 engine. **It does not fit the N26 engine.** This product is intended for off-road competition use only and is not legal for use on pollution-controlled vehicles on public roads or highways. It is for sale for all 49 states excluding California, and a Vehicle Compliance Waiver must be signed. It is not for sale, installation, or use on licensed vehicles in the state of California.