I agree, an exhaust kit would be better. No reason to hack up the exhaust unless your only goal is to be loud.Why not a 4 or 5 inch exhaust kit? I'm not following/understanding why you would put a stack under your truck. You would have to fab up some hangers to make it work I'm assuming?
its only 90 bucksI would not recommend spending the money on a stack that you can't see. Just go with a 5" system and cut it somewhere after the cab, preferably after the axle.