Hey guys so sorry about the late reply, haven't had time to update use, I PASSED AND SHES BACK ON THE ROAD AND REGISTERED :-D, just slapped a Euro 4 cat and now it's barely letting any emissions out, my NOX levels dropped to 0.08 unbeleivable, aswell as this cat actually produces more flow and made the exhaust louder but it does it's job emission wise, everything has been engineered and the car has now been re-registered, I would just like to thank everyone for the help and input, I really honestly do appreciate it, thanks.