Standard slip-on system with catalytic converter eliminator and Street Slayer muffler(s). This mounting style mounts much like M4's "GP" system. Much lower and forward than stock, near the right rider foot peg. Enjoy the same style benefits as the "GP" mount with a slightly lower dB level. These systems utilize the stock header assembly. Slip-ons replace the stock restricted muffler resulting in better sound and an increase in power. M4 silencers look as good as they perform. Note: M4 recommends re-flashing your stock ECU to unleash the full potential of all M4 products. Note: All M4 systems are designed and intended for closed-course competition use ONLY.