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-Davidson® factory saddlebags and centerstand. All necessary instructions and hardware included. Made in the U.S.A..