Empire Industries Big Bore Gen 2 Exhaust for TRX 450 04-05. Specifically designed for Big bore and stroker motors. Our unique triple-stepped head pipe pulls more Horespowe out of your motor than our competitor's pipes! 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. If you're not running 1 you're probably behind 1 !!!! We have dyno tested are pipes against the best! We are always pleased with the results. Get on the Empire Industries team and see what all the buzz is about!