Thanks, I think I understand most of it, but there're still a few questions I wanted to ask, if I gone for straight thru design, would the engine be running to lean? I guess the sound would be awesome, but probably unbearable over long distances confused2

I'll be using this company http://www.jpexhausts.co.uk/
Heres a pic of my dodgy sketch...



Fig "A" is the std sidepipe, but no idea what the internal design looks like.

Fig "B" is a cut away of my proposed internal design, I'm hoping this might give me the bass/woofle I needed without being too loud, the material will be made out of mild steel rather than stainless as I believe stainless gives out more hard edge sound.

Your comment of this design will be much appreciated even if its a bad one oops thumbs