The Pro Moto Billet spark arrestor endcap utilizes the stock exhaust pipe. To install the endcap all that you have to do is pull the bolts out of the stock endcap, pull it out, and slip in the new Pro Moto Billet endcap. This spark arrestor endcap uses a removable, U.S.F.S. approved, screen type spark arrestor. The whole endcap assembly has been U.S.F.S. approved, and is engraved accordingly.