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.
* 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 header and tail-pipe
* Repack Kits, optional Inserts are available for all models
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
RS-4
* 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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