98-02 KAWASAKI ZX9R: Yoshimura RS-3 Bolt-On Exhaust (Street/Stainless Steel/Aluminum) The race-bred RS-3 exhaust has proven to be extremely popular among riders for a combination of performance and value. It enhances performance dramatically, provides an enviable exhaust note and offers the unmistakable look and sound of Yoshimura. RS-3 mufflers feature a straight baffle that leads to a single turn-down machined aluminum end cap. Oval-shaped sleeve. Large volume of packing material.