Two Brothers Racing 005-1120407 M-2 V.A.L.E. Slip-On - Carbon Fiber This type of system replaces your existing s-bend pipe and exhaust canister. S-bends are manufactured from .035in. thin wall stainless steel; polished to a mirror finish. Only #304 stainless is used which will never rust. These systems not only add horsepower but also can drop significant weight from your bike. M series exhaust canisters feature the highest level of quality construction and are designed to be fully serviceable in the event of damage, routine maintenance or the occasional repack.