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Features: FACTORY 4.1 RCT EXHAUST SYSTEMS. The Factory 4.1 RCT incorporates the latest in FMF Resonance Chamber Technology™ both internally and externally.. In addition, we achieve a shorter overall length that is less susceptible to crash damage and complementary to our 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 our exacting specifications and is manufactured 100% at our Southern California factory.. NOTE: Will not pass 2025 FIM sound regulation.