Ok, Calling all 5.0 experts! I have a basically stock 91 Notchback, upgrades are shortie headers, MAC High Flow Cat H pipe, Flowmaster cat back exhaust and a MAC cold air intake. Im looking for some power up grades that will keep it emissions legal. It also has an AOD with a shift kits and 3:73's. Keep the cost in mind, I dont want to totally drain the wallet. Thanks