there are a few places that sell exhausts but then also do manufacturing on the side. i went to a place at "rayliegh wier" (essex) to get mine made. i got a 2.5" pipe with a silencer to match it made from stainless with a fat bolt up clamp that aint breakin for shit. and it was only 100rubs. the tail end of the pipe was left bare though. if you do find a place like this you can tell 'em where you want it routed and where the bends are etc. (aiding better airflow). i cant remember the name of the place but i can find out for ya!