ive got a 3 inch exhaust hi flow cat and thats about it, i was comtemplating doing the front pipes but i mite wait and see if i can get a good price to rebuild my turbos (just as GTR032 did) and then do dump pipes and front pipes..
I would be very happy with that sort of power on 11psi as you have got..
im hanging out to do a power run and see what i have got at the moment?