FMF Racing Powercore 4 Aluminum Slip-On Muffler w/Stainless End Cap for Honda XR650R 00-07FMF PowerCore 4 Slip On Exhaust Honda XR650R When designing the PowerCore 4 Exhaust, FMF took a hard look at their top of the line mufflers to produce race inspired performance at a more economical price. The end result is a quality muffler that delivers improved torque, increased horsepower and rugged durability all at a price that won't break the bank. Features: Increase in power and torque through entire RPM range Durable stainless steel and