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Yoshimura RS-4 Exhaust 
 
Exhaust features:
Parallelogram-shaped muffler
Increased muffler volume over stock system, resulting in better throttle response and improved noise cancellation
Light-weight muffler construction with carbon fiber end-cap
CNC machined muffler bracket
Reduced weight over OEM system
Vertical tail-pipe divider splits the exhaust gases more evenly, for smoother flow, which improves mid-top power and throttle response
Stainless steel header and tail-pipe