Yoshimura RS-4 Signature Slip-On Exhaust for 350 SX-F 17

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The work that went into developing the RS-4 muffler has paid big dividends in Off-road Racing; winning multiple Supercross and Motocross titles since it's inception. We’ve developed the current generation RS-4 based on that research & development, and the result is a unique design that provides an unrivaled combination of power and quiet exhaust tone. The RS-4 features a Polyresonant duplex chamber and two-staged stepped baffle for increased performance, while a carbon cone end cap finishes off its innovative styling.

* Delivers huge power at a very light weight
* Offers better handling thanks to a lower centralized mass coefficient
* Uniquely-styled pentagonal muffler body with a carbon fiber cone end cap
* Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power
* Two-staged, stepped baffle
* System and slip-on muffler body is a brushed aluminum sleeve with carbon fiber end cap
* System comes with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box

Signature series exhaust

* All Signature series exhaust are tested, documented and marked with appropriate EPA noise emissions labels
* Do not require changing the motorcycle's emissions control systems
* CARB and EPA emissions "Replacement Parts"
* Certified by independent laboratory for EPA noise levels


* Completely hand-fabricated full dual-muffler exhaust system gives your DR-Z400S that cool hot rod look and sound
* Exhaust headers are TIG-welded stainless steel construction
* Stainless steel Y-pipe and tailpipe
* Pentagonal-shaped muffler sleeve
* Front muffler cap functions as a polyresonant chamber that helps to reduce muffler noise
* Two-staged stepped baffle
* Carbon fiber end cap
* Custom Yoshimura kickstand included

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Yoshimura RS-4 Signature Slip-On Exhaust for 350 SX-F 17

Yoshimura RS-4 Signature Slip-On Exhaust for 350 SX-F 17