Originally Posted by AdamF
Okay, say I get a GS-R. It'd leave me with money to spare, obviously. For say, 2000-2500 dollars, what kind of performance/handling modifications should/could I do?
As hard as this may be to do, put the money in the bank.
Drive the car in stock form and autocross it and do high performance driving events with it. Later down the road buy a set of wheels and tires for track use. Perform routine maintenance on it and enjoy the car.
Every time you get the urge to modify the car, remember that you ultimately will not keep this car.