EXHAUST ALUM 4.1RCTMGBMB Polisport Select applications available in SX Hydration Bags Select applications available in SX version that is designed for more low to mid range power and an MX version that is focused in the mid to upper rpm range To be used only and exclusively when the technical specification booklet provided with the HRC KIT recommends MOTUL 300V Factory Line Racing Kit Oil 2376H 0W 30 as engine oil lubricant Model: Factory 4 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