the basics - I guess....
-make system exhaust more free flowing (headers, performance cataylst converter, muffler)
-hot ignition system
-electric radiator fan instead of mechanical
-weber carburetor if you have a carburetor
-hi flow air filter like KN if you have fuel injection
I put some headers on my 87 22R-E and it opened that thing up! i used to have to redline in second and third while getting on the freeway now im shifting at 3grand and still have plenty of power left. If you dont do anything else, make sure you grab some headers and a flowmaster cat and muffler. Sounds great too