i realise a turbo back exhaust has already 'boosted' the turbo because its less restrictive, but what i was trying to say is that i wouldnt go any further. i think i pretty much have said what i want to acheive, if your still confused, i dont know what else i could say.
Basically mechanics and other drivers with the afc and pfc have said in relation to my car, a pfc is over doing it, but they think i should get it INCASE i choose to futher modify the engine