Hello, new to the forums. Well, first off, im 16 and going to get my license in Spring '11. I have $15,000 as my budget for my first car. I plan on getting like a 2003 or 2005 WRX sti, but i also want to put money in it for my own project. My first purchase will probably be a magnaflow exhaust system, other than that i have no idea. Any suggestions for stuff i should invest in for performance?