Upgrading the center section of your exhaust often removes some restrictions, mainly catalytic converters, giving your vehicle both more power and more sound. We offer several different exhaust brands to get your vehicle sounding exactly the way you want it to!
The Rogue Engineering E85 MZ4 X-pipe replaces the stock BMW resonator between the catalytic converter and the rear mufflers. The RE E85 MZ4 X-pipe is made to fit in the place of the factory resonator. Other features include: Fits all MZ4 Coupe/Convertible from 2006-08 Weighs only 11.35 lbs. for the entire assembly. The factory part is over 15 lbs. 100% T-304 stainless steel construction and internals, a majority of the exhaust made from 16 gauge stainless steel. Fully mandrel bent tubing, no crimps or flattened areas Mil-finished. Full TIG welded construction, no lock seams or pinch welds. Factory-like hangers for OEM fit. Fits with factory or aftermarket mufflers (that use flanges). Optimized tubing sizes and minimized bends maintain exhaust velocity without compromising necessary backpressure Deep, throaty tone, without the drone. Will not change ground clearance Will not void factory warranty Will not affect emissions
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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 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.
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