Hi John I use oem petrol back boxes and Y pipe, I have been making up the 400mm or so "missing" section with a couple of flexis, It took quite a while to do the first one, I can do one now in about 3-4 hours, I am about to buy a exhaust pipe bender and flarer so I will be offering a one piece solution shortly, Subframe has to be lowered but thats the hardest bit.