Not trying to be a wet blanket, but since you're 18/19 now, you should probably save that money for university. $6000 is alot of money to be dumped into a used car. Or you could save that money until you get enough to buy a faster/nicer car like a 300ZX/328is/Eclipse/ etc.

But with 6000 you could easily swap your engine with a GSR or ITR b18 engine