Yoshimura Signature Series exhaust components are the answer for riders faced with ever-tightening noise and emissions regulations at the federal level. All Signature Series components are independently tested, documented, and marked as required by state and federal regulations as CARB/EPA-compliant.
The work that went into developing the RS-4 slip-on muffler design paid big dividends during development in AMA Pro Racing. That research was directed at developing the RS-4's unique design that provides an unrivaled combination of power and a quiet exhaust note. The RS-4 muffler features a polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.
Easy-to-install slip-on design
Pentagonal-shaped sleeve
Front muffler cap functions as a polyresonant chamber which helps reduce noise
Two-stage stepped baffle
Carbon fiber end-cap
CNC mandrel-bent stainless steel tail pipe
Includes instructions and all required installation hardware
80dB EPA noise emissions compliant
Product Note:
Specification
Details
CARB Approved
Yes
Country of Origin
USA
Header Construction
Varies (make selection above)
Mid-Pipe
Varies (make selection above)
Muffler End Cap
Carbon Fiber
Muffler Sleeve
Aluminum
USFS Approved Spark Arrestor
Varies (make selection above)
Warranty
1 Year Manufacturer Warranty
Vehicle Fitment
Fitment is guaranteed or your money back plus free return shipping.
Don’t waste time installing a product that doesn't fit. We worked hard ensuring that this product is an exact fit on the vehicles listed below.
