Empire Industries Cyclone Series Exhaust System for KFX 400 04 to current. TIG welded 304 Stainless Steel Construction. 6061 Aluminum silencer with billet end caps make for easy re-packing. Billet silencer caps available in anodized Red, Blue, Black, Orange or Raw. Available in the following styles: Brushed, Powder-Coated Black, & Polished.