OK....first thing is BEWARE of asking questions before using the search button. So many topics have been discussed and people on this forum will tear you up if you ask questions like this that have been asked billions of times before. Trust me on that. But the basic mods that most people do is a header (usually hotshot header), a CAI (AEM, Hotshot, Injen), exhaust (most people on here will attest by stromung, but greddy makes one, as well as VRS, and some others as well), short shifters (made by either nismo, or TMW I believe), the only computer control module they make for our cars are the universal ones like Apexi SAFC II and Greddy E-Manage and things like that. DO NOT BUY ECU CHIPS OFF EBAY WHATEVER YOU DO! It will mess up your car guaranteed. There is also a balance shaft removal kit from Jim Wolf Technologies (JWT), Unorthodox Pullies, camshafts from JWT I think , nitrous wet kits, turbo's by either Powertech Imports or Travis on this website, koni adjustable shocks, JIC coilovers, TEIN Coilovers, TEIN, Eibach, Progress, Tanabe, and other lower springs, body kits, rims, tires, sway bars (nismo or eibach), and the list goes on. There are a fair amount of veterans on this website to help you out including Travis and Stephen (Niceguy) which are probably the two best gearheads on this site that I can think of. The best websites to buy from are Jamie from powertechimports.com and andy at hpautoworks.com as well as ptuning.com and southwestautoparts.com and blah blah blah. I'm done for tonight. If you have any questions, you can PM me or hit me up on AIM at berber5985. Welcome to the forum and I hope some of that helps you out a little. There is much to be learned young one. Enjoy the search button because you should be spending a lot of time there. Be careful being a newbie and good luck!