Yoshimura Rs-4 Street Slip-On Exhaust KTM 790 / 890 Adventure / R / Rally / Husqvarna Norden 901 The Yoshimura Rs-4 Slip-on exhaust features a carbon fiber cone end cap, two staged stepped baffle and striking good looks. The Rs-4 muffler features a new front cap design that functions as a polyresonant chamber, thus creating a more quiet muffler with improved mid to top end power. Along with improving sound and power, this system moves the muffler weight lower and closer to the bike for improved handling and weight distribution. Features: Pentagonal-shaped sleeve Yoshimura's Works Finish for increased durability & adventure friendly design Integrated inlet heat shield design for a seamless transition with the stock heat shield Two-stage stepped baffle Removing the stock muffler saves weight Carb/Epa tailpipe emissions compliant