Empire Industries Cyclone Full Exhaust for Yamaha YFZ 450r With 16″ Can, 2″ Core, Resonator Pipe with Turn Down. This new full exhaust system passes the new AMA 96 db Restriction. TIG-welded 304 Stainless Steel Construction. 6061 Aluminum silencer with billet end caps makes for easy re-packing. Billet silencer caps are available in anodized Blue or Black. Silencer Cans are available in the following styles: Brushed, Powder-Coated Black.