Designed specifically for the Revolution Max 1250 motor, the Vance & Hines Adventure Hi-Output 450 delivers a strong increase in horsepower and torque versus the bike's stock Revolution Max exhaust system while reducing overall weight of the exhaust by approximately 6 lb Cutting-edge baffle design delivering bold rumble while meeting J2825 decibel levels 4-1/2" diameter slip-on delivers over 5 hp and 5' lb torque CNC-machined billet end cap Compatible with Harley-DavidsonĀ« factory saddlebags and centerstand All necessary instructions and hardware included Made in the U.S.A.. MUFFLER SS HO-450 PAN-AM