Yoshimura RS-4 Signature Series Full System - Aluminum Muffler 218320S320Delivers 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 Tapered headpipe delivers optimal flow and performance Titanium systems include non spark arrested 99 dB motocross insert (unless