7psi would be cutting it close for all those parts. Rember if you go over the power of the MAF it will die...I have had a couple. Anyways. Rom tune yes, FMIC for more than 7 psi yes. Stock injectors are good to 260rwhp, but again cutting it close. Your best bet is to pick up a set of 480cc's off a S15 (duh) I have a set of sale. PM me, but thats somethign else. Stock O2 housing can be used, but the new larger ones are like 100 bucks so if you can break the piggy bank it might be worth it. Other than that a SPL intake pipe has to be made because the bolts are off a few degrees to fit. I think people take the stock intake elbow cut off the flange and reweild it a few degrees.