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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.Their P1-X PowerTip Sound Suppressor Is a Recommended Accessory for All Two Brothers 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 in Conjunction With a Spark Arrestor Screen.