Yoshimura Rs-12 Slip-On Exhaust Suzuki Dr-Z4S / SM The Rs-12 Enduro Series slip-on enhances performance with a 4.1 increase in horsepower at 8,000rpm and a 2 bump in torque at 4,800rpm, thanks to the included Usfs approved spark arrestor Sa-19-K from Yoshimura. This addition allows riders to effortlessly transition to their preferred off-road areas. It also comes with a custom stainless Yoshimura heat shield for added protection. Proudly designed, developed, and manufactured in Chino, California, the Rs-12 is a testament to Yoshimura's commitment to quality. Features: Developed and tested over 24 months with factory level race teams The Rs-12 allows for maximum muffler volume which helps manage sound and add power Improved performance gains and weight reduction Works-look matte carbon fiber end cap with industry leading design Carbon end cap covers inner cap mounted design which improves durability and eases servicing as compared to other sandwich mounting designs Patent pending Precision Taper Fit (Ptf) insert ring makes it easy to install and remove sound inserts and spark arrestors Tapered muffler body inlet design of the Rs-12 enables the system to be pushed forward thus helping with weight centralization without sacrificing performance Made in USA Weights: Stock slip-on: 13.6 lbs. Yoshimura Rs-12 slip-on: 9.2 lbs.