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.
Street series exhaust
* Deliver performance in a slip-on/bolt-on muffler package
* Do not require changing the motorcycle's emissions control systems
* Marked with appropriate EPA noise emissions labels
* CARB and EPA emissions "Replacement Parts"
* Not tested for EPA noise levels
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Yoshimura Street RS-4 Slip-On Exhaust for ZX6R 09-12
$389.00