Yoshimura RS-2 Stainless Steel/Aluminum Full Exhaust System - Yamaha YFZ450 2004-2008 The RS-2 is a potent and versatile design that evolved from Yoshimura's original TRC, engineered to provide increased power and power delivery. With a different pyramidal shape that features increased volume, the RS-2 is a quieter system with a larger core - and it offers the added bonus of outstanding performance in a value-priced package.Stainless construction.New diamond-shape can allows for m Enduro Series systems are an evolution of Yoshimura's early off road efforts crafting off-road exhaust systems. The Enduro Series are all equipped with U.S.F.S.-approved spark arrestor, forest-friendly noise levels, and are tailpipe emissions compliant. (CARB/EPA tail-pipe emissions compliant; all applications are marked with appropriate EPA noise emissions labels.)Race Series: If you're looking for that competitive edge, look no further than Yoshimura's Race Series.