Competition Series 4.5" Catless Downpipe B58

The Evolution Racewerks Competition Series 4.5" Catless Downpipe is a premium exhaust upgrade engineered to maximize performance for BMW's B58 six-cylinder turbocharged engines. Constructed from 100% 304-grade stainless steel, the downpipe features a robust 4.5" diameter with mandrel-bent piping for smooth, unobstructed exhaust flow. The entire unit is 100% TIG welded for superior weld quality and durability, and it includes a precision CNC-machined turbocharger V-Band flange to ensure a seamless transition from the turbo outlet. Available in a standard brush finish, with an optional polish finish, and a high-temperature black thermal coating to further reduce underhood temperatures and enhance corrosion resistance. The primary benefit of this catless downpipe is a substantial increase in horsepower and torque throughout the entire powerband, not just at peak RPM. Users can expect improved throttle response and significantly faster turbo spool, effectively reducing turbo lag and making the vehicle feel more responsive and powerful. The 4.5" piping diameter is specifically chosen to match the larger outlet of the B58 turbocharger, preventing any flow restrictions or turbulence that would occur with smaller diameter piping. The downpipe also offers optional bungs for additional wideband O2 sensors or EGT gauges, allowing for more precise engine monitoring. This product is intended for off-road competition use only and is not legal for use on pollution-controlled vehicles on public roads. It is for sale for all 49 states excluding California, and requires a Vehicle Compliance Waiver. It is explicitly not for sale, installation, or use on licensed vehicles in California.