Welded on is the best way to do it. I wouldn't use a clamp. There's places (exhaust shops) that can cut your stock muffler off and weld this one on, they can do an axle back meaning just from your back axle back (similiar to just cutting your stock muffler off and welding this one), or they can do cat-back... replacing your stock piping and stock muffler with this one and the size piping you desire and they can make work. Since its 2 1/2" inlet, get 2 1/2" piping cat-back if you want to make it beneficial... if not do the first thing I said.