The Copperhead XL Minarelli is track proven and highly praised. The XL has a considerably larger "belly" that is best used with motorized bicycle engines between 80 and 125cc. Its size is comparable to the yz85. These, as with all new Copperhead pipes, feature slip-fit header/stinger and flexible side mounting system. Silencer and all attachment springs also included. Made of Stainless Steel