Two Brothers P1 Power Tip Many municipalities and tracks have begun to implement new, tougher regulations that limit the sound output of street bikes, offroad cycles and ATVs. Two Brothers Racing has developed a series of highly effective sound reducing tips which can help you be compliant. Two Bros' P1 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 3-4 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 and reassemble. P1X Power Tip also available for 7-8 dB of sound suppression.