Empire Industries Exhaust system for Yamaha WR 450 2012-2018. Bolt on huge power gains across the entire RPM range with this Full Exhaust System. Very strong pull off bottom end with a smooth transition to a long top end pull. Great sound and performance. Empire exhaust systems 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.