Yoshimura KTM 1090/1190/1290 Adventure Street RS-4 Slip On Exhaust SS-SS-CF

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with winning the AMA 450 Supercross and Motocross Championship series, and again in 2012 winning both 250 Supercross Lites titles. That same R&D has been directed to developing the current generation RS-4 for Road Racing a unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4 features a Polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.

• Pentagonal-shaped sleeve
• Front muffler cap functions as a polyresonant chamber which helps reduce noise
• Two-stage stepped baffle
• Carbon fiber end-cap
• Stainless steel tail-pipe

Yoshimura Street Series Exhaust Systems - All Yoshimura Street Series systems are Slip-on/Bolt-on applications that do not require tampering with the vehicle's emissions control system, yet still deliver that special spirit the world has come to expect from the legendary company known as Yoshimura. Street Series applications cover all of the iconic profiles that Yoshimura has become famous for. From the legendary tri-oval profiles to the refined carbon fiber R-77 mufflers, and even our R-55 angular masterpieces. Our Street Series exhaust offer street-legal options for almost everything on two wheels.

Yoshimura RS-4 Muffler Option Key:

RS-4 (SLIP-ON OR FULL SYSTEM) SS-SS-CF:
Stainless Steel Sleeve with Carbon Fiber End-Cap

RS-4 (SLIP-ON OR FULL SYSTEM) SS-CF-CF:
Carbon Fiber Sleeve with Carbon Fiber End-Cap

Yoshimura Exhaust Description Guide