wasnt being a ***** man.... just saying if your not for sure someone is right look it up before ya post is all...heck thats what these forums is all about is helping each other..as far as why some pipes are skinny or fat I think it would be how its chambered...some pipes are just a aluim tube and nothing more...John is right on experience and listening to others on what pipes work or dont work well...anyways the length of the pipe is SUPPOSED to have a different effects on performance..
I have heard good things about the ae pipes with a vx or sh engines...but thats just what I hear