YOSHIMURA RS-4 SLIP-ON EXHAUST 11-15 250-450SXF RS4-COMP SO AL/CF-T*94
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An evolution of Yoshimura's off-road exhaust system
Equipped with USFS-approved spark arrestors, forest-friendly noise levels and are tailpipe-emissions compliant
Marked with appropriate EPA noise emissions labels
Not tested for EPA noise levels
Delivers huge power at a very light weight
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
Aluminum Muffler / Carbon Fiber End Cap
The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year, and again in 2012 with the Yoshimura-backed GEICO Honda team winning both 250 Supercross Lites titles. That same R&D has been directed to developing the current generation RS-4 — 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.
Features:
- 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 tail-pipe
- Series: Race
- Muffler Type: RS-4
- Muffler/End cap Type: AL/CF