Yoshimura RS-2 Race Series Slip-On - Stainless Steel Muffler 146702C550Each Race Series system is developed in accordance with noise compliance regulations imposed by most racing sanctioning bodies worldwide. FOR CLOSED COURSE COMPETITION ONLY; NOT INTENDED FOR STREET USE All applications are marked with appropriate EPA noise emissions labels Has not been tested for EPA noise compliance The RS 2 is a quieter system with a larger core and it offers the added bonus of outstanding performance in a value priced package.