you will need to re-tune the pfc when u eventually do get a FMIC, that is the only downside, u should still get some nice gains out of it though
talk to turbotechnics at cardiff, they can get u a FMIC without body chopping, mines an AVO turbo on, 500x350 or sumthin, good for 500hp and has the pipes return on the same side, so no cutting is needed, as for a pfc tune, got to the NSW section and do a search theres 2-3 active threads around about it