I literally just did a little write up in the N/A section about N/A Mods ---> What can an N/A mod do for you? , check it out, read the one blue put up there, if you can't find a place to start after that then I don't know what to tell you. Tons of good resources, people, and experience on this site.

And like everyone said, don't waste your money on a cat-back. Wait until you put down some real power, which will be some time from now, if ever, unless you're loaded.

Good luck!!