BimmerWorld/CPI Rasp Terminator for the E46 M3 (also for MZ3 and Z4M) is a tuned front section that:
Greatly reduce rasp from the S54 engine
Balance exhaust pressure for each bank with H-pipe crossover
This Rasp Terminator follows the original Custom Performance Innovations (CPI) design which has been specifically engineered to reduce the exhaust rasp inherent to the S54 engine. The S54 rasp is excessive and tuning it out requires the right combination of resonators, placement, and tubing size. CPI designed their own section 1 after other designs on the market fell short. Rasp is reduced by approximately 80% on a M3 equipped with aftermarket headers.
The latest RTX incorporates an H-pipe crossover that equalizes exhaust pressures in both banks before they merge for section 2. This reduces turbulence and improves exhaust flow. While not designed to gain power and torque, dyno testing showed slight gains with this system. Fitment has also been improved for better ground clearance. Tubing is a full 2.36" (60mm) and 304 stainless steel throughout. It will bolt on to most headers and to any section 2 that uses the factory-style flanges.
CPI exhaust is now manufactured for BimmerWorld by Magnaflow in California and carries a limited lifetime warranty.
Video: CPI RTX with stock exhaust:
2001-2006 E46 M3: no notes, direct fit
2001-2002 MZ3 S54: one pipe must be shortened to match factory section 2
2006-2008 Z4M: flanges must be cut and rotated to match the flange orientation of the stock exhaust
Made in the USA.
3 Series E46 (99-05) > M3 Z Series E36/7 / E36/8 Z3 (96-02) > Z3 M - S54 Z Series E85 / E86 Z4 (03-08) > Z4 M
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$519.99E46 M3 BimmerWorld/CPI Section 1 Rasp Terminator with CrossoverHigh quality and excellent fitment front section for reducing S54 rasp