All Yoshimura Enduro Series exhaust components are equipped with USFS-approved spark arrestor, have forest-friendly noise levels, and are tailpipe emissions compliant.
The work that went into developing the RS-4 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.
Pentagonal-shaped sleeve
Front muffler cap functions as a polyresonant chamber to reduce noise
Two-stage stepped baffle
Carbon fiber end-cap
Stainless steel header and tail-pipe improves flow over the stock exhaust
Includes all required hardware and installation instructions
USFS-approved spark arrestor
Product Note:
Specification
Details
CARB Approved
Yes
Country of Origin
USA
Header Construction
Stainless Steel
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.
Honda
CRF450X 2019-2024
Yamaha
WR450F 2012-2015
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