Powercore 4 HEX Slip-On Exhaust for 18-19 Yamaha YZ450F

Computer designed, then dyno tested for each 4-stroke model listed_x000D_ The highest-flowing exhaust system offered means top performance_x000D_ Trademarked Square Core inner design has a larger surface area then old-style round cores_x000D_ Stainless steel mid-pipe mates to the computer-designed aluminum rear can; elliptical aluminum canister for peak performance_x000D_ Depending on the machine, square or round perforated steel inner cores create optimum flow with Hi-Flo technology_x000D_ It all adds up to greatly improved flow and substantial power gains_x000D_ Substantial weight reduction when compared to stock_x000D_ Includes a Forest Service-approved spark arrestor; arrestor does not hamper the exhaust flow so there is no performance loss