What can I do to make my car better?

I have a 1993 Honda Prelude. I already have a fart muffler on it. It's a manual. I'm going to tint all the windows and put a new stereo in it and probably new speakers. I'll also put a small Vtec sticker on it somewhere too. What can I do? What can I do to the body? What can I do to the engine?