Muffler Type: RS-4. Header/Muffler/End Cap Type: Stainless/stainless/carbon. EMIS Category: 3.

• Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power
• Two-staged, stepped baffle
• Meet noise level regulations of most worldwide race sanctioning organizations
• Marked with appropriate EPA noise emissions labels
• Not tested for EPA noise levels
• Delivers 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
• For closed-course competition use only; not intended for street use
• Tapered headpipe delivers optimal flow and performance
• Stainless systems come with 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box