Designed for maximum torque and power across torque curve. Made from durable 16 gauge steel body with a lightweight aluminum rear end cap. Features a “quiet” 86-92dB sound level. Includes U.S.F.S. approved, removable screen-type spark arrestor; replacement spark arrestor sold separately. Bolts on to stock headpipe in minutes. Repackable muffler body. Made in the U.S.A..