Not sure if this should be in general or tech, but here's the question anyway. I'm wondering what effect different shapes and sizes of slip-on exhausts will have on the note of the exhaust. eg: Will an oval shaped exhaust sound different to a round exhaust? Will a larger diameter exhaust have a deeper note than a smaller one? And what effect would the length have? I'm not interested in what people think "looks better", or "sounds better", I've already made my mind up there. I would just like to know how the change in pipe would change the sound. Thanks:grin: Here's the two pipes in question: "GP" "Oval"