Our P1-X PowerTip™ sound suppressor is a recommended accessory for our exhaust systems with M series endcaps. A straight-through sound diffuser, the TBR PowerTip™ quiets the pipe about 7-8 dB with no significant reduction in horsepower. May be used with a spark arrestor screen. Easy to install - simply unbolt your existing M series endcap, drop in the P1-X and reassemble.