1st off - how many miles on your car? Do you have a CAI? I'm asking because it sounds like you want to throw parts at it to increase power and I'm curious as to what you have already. Too many folks start bolting stuff on only to find they exagerated another problem - like bolting superchargers & turbos onto older car and that usually leads to damaging engine parts, blowing gaskets, burning up fuel pumps amongst other things. Make sure your engine is prepared for all these "additionals" so you don't accumulate a barrage of headaches and a big hole in your wallet. Experimenting with MAF software isn't cheap and whatever you do, don't use e-bay as a guide for ideas - they'll be happy to sell you stock chips advertised as super HP units.
Remember all of your original parts have worn together from day 1, so any changes you make are going to exert more energy on them.