Empire Industries Cyclone Series Exhaust System for Honda CRF 450 R 06/07. 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 make for easy repacking.