Took it to unigroup, still didnt make power after fixing exaust housing issue but found the exaust to be smaller than 3inch in the mufflers, a fair bit smaller, so got a new cat back made by performance exaust in northmead, really happy with workmanship and the service they provided, so is now 3.5 inch all the way through, straight through 3.5 inch mufflers, will be booking it back in with unigroup asap, was told the exaust was dropped at the place i went to before but the turbo issue was still there so now the exaust side of things are all sorted, the car felt better after the turbo was sorted but feels heaps better with this exaust on but its only got a basic tune so i cant stretch its legs will post after i take it back to unigroup