What Performance stuff can i put in besides an airfilter and a muffler?

probably not alot, i did however see a sunbird with a body kit here in saginaw, michigan, he is a friend of mine and i will ask him where he got it........is it a drop top or hard, and you could probably put a wing on the back of it too......whatever you want man

Well, you can save your money and then buy something else latter and just live with what you have, or you can spend a lot of money and maybe drop in the new DOHC 4 cylinder GM is making (is it ecotech or something like that?) which can be supercharged, but, this will be very expensive for what you get. I really don't know what all could be done to the car, I think you're rather limited, and in the end, would be better off starting with something else. Good luck figuring it out, Josh.