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Features: The Factory 4.1 RCT incorporates FMF Resonance Chamber Technology™ both internally and externally. In addition, achieves a shorter overall length that is less susceptible to crash damage and complementary to Factory Forward Engineering - moving the muffler closer to the motor to centralize mass. The Factory 4.1 RCT is constructed from only aerospace grade materials that meet exacting specifications and is manufactured 100% at the Southern California factory. Includes the spark arrestor and quiet insert (94dB).