You're 16, I wouldn't worry about fixing it up into anything special. Get all your maintenance taken care of, and save up for one thing at a time that will actually improve your experience with the car. With that kind of mileage there's obviously not going to be much value left in the car so you should really think about how much longer you plan on keeping the thing and how much money you want to drop. There has to be some point when you decide that you want to spend your money on nice things (girls, expensive electronic gadgets, clothes, etc) instead of continually saving up for one mod at a time for an older car with a lot of mileage. If you want, get stuff that provides a good baseline to work with and keeps the car in good shape for possible stuff down the line.