Could you clarify what you are wanting to get out of it? Or are you looking for a general list of mods?
What I mean by that is, are you looking for around town performance, weekend fun in the canyons, drag strip, race track, commuting.
If your wanting a general list, then try:
Air filter
Airbox mod
Full exhaust
Block-off plates
Ecu Flash
Basic tune
520 chain conversion
These mods are at least cheaper on the wallet.
If you looking for stupid power, look into turbo or a nitrous set-up. Once you go down this road, engine maintenance is going to be a priority, and building your motor is going to cost you. Not worth it IMO.