The Factory 4.1RCT muffler is all new & incorporates the latest in resonance chamber technology.
The new chamber design of the muffler also allowed FMF to enhance & refine exhaust pressure through a series of internal chambers while meeting FIM 2M-Max sound test as well as the AMA 94dB standards. Including the Bazzaz Z-Fi Fuel Management System, control your air/fuel ratio from fuel injectors to improve horsepower, torque, & throttle response. Correct for maximum performance.