Just a thought out of left field.
If you just want to have fun. The cheapest bang for buck is nitrous. A dry kit woulod cost you about $1,000 and you could install it yourself in a day. You would have to check your particular engine but usually no computer modifications are required as the computer senses the vacume change and gets the standard injectors to pump in the extra fuel.
The only drawback is.........its illegal on the street