Hi Guys, I am thinking about getting a tune for my fg with just upgraded fuel injectors. So far I got quoted $ 2100 for a custom tune with custom bigger fuel injectors. My question is I have another 400 to spend. Should I go for a CAI? Or since I have a quad cat back exhaust should I get a bigger CAT? How much power increase should I get? Can anyone please advise?? Best tuners in Sydney?