Did them on my dodge half ton 3 times. Not fun. Don't put new ones on take the warped ones to a machine shop and get the to machine them flat. Metal will only warp so far. So they will last longer then new ones
Good Morn My manifolds were both cracked and studs broken off. Only 8mm studs holding all the exaust to motor the rest is rubber mounted not a good deal. Also moves with frame. Will never be any good.