HMF Offroad Full Exhaust System & Slip-OnsHMF's Offroad Full Exhaust System & Slip-Ons are specifically designed for 4-stroke dirt bikes. Available in slip-ons for most MX, enduro and dual sport bikes. These mufflers are packed with guaranteed horsepower and torque. Ideal for racing, trail or street riding. Made from 304 stainless steel inlets.