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Features: FACTORY 4.1 RCT SLIP-ON MUFFLERS. RCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power output. Internal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of power. FMF's Factory Forward Engineering centralizes mass and is less prone to crash damage. Innovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screws. Compatible with stock header or FMF header. QuietCore 94 dB insert included. Spark arrestor included in muffler. Available in natural titanium or blue anodized finish with titanium or carbon fiber end caps. Meet AMA and FIM sound requirements. NOTE: Will not pass 2025 FIM sound regulation.