Empire Industries Gen 1 Cyclone Series (Round Can) Exhaust 2009+ Yamaha YFZ 450R/X Fuel Injected models. Bolt-on huge power gains across the entire RPM range with our Full Exhaust System. Our unique step pipe design pulls every bit of horsepower out of your motor. We have the Best Horsepower producing Exhaust on the market! With our great sound and performance, you will be the envy of all your friends. Our pipes are built right here in the USA and constructed of mandrel-bent, high-grade, 304 stainless steel. Tig welded 6061 aluminum silencer with billet end caps makes for easy repacking. If you're not running 1 you're probably behind 1 !!!! Dyno-proven Performance and Track tested.