FACTORY 4.1 RCT SLIP-ON MUFFLERSFACTORY 4.1 RCT SLIP-ON MUFFLERSRCT (Resonance Chamber Technology) features a patented core shape that lowers decibels while maintaining maximum power outputInternal ducts in the chambers of the RCT system increase internal volume for improved exhaust flow, resulting in power gains throughout the entire range of powerFMF's Factory Forward Engineering centralizes mass and is less prone to crash damageInnovative rear end cap features simple installation of tuning tip inserts or spark arrestor with the removal of four screwsCompatible with stock header or FMF headerQuietCore 94 dB insert includedSpark arrestor included in mufflerAvailable in natural titanium or blue anodized finish with titanium or carbon fiber end capsMeet AMA and FIM sound requirementsFACTORY 4.1 RCT STAINLESS SL (SLIP-ON) W/ CARBON END CAP