Intake, shifter, tune, gears, nitrous
. Gotta be careful with the spray though. Don't go over a 100 shot on a stock motor. If he's going to run it at the track, TIRES! Gears won't kill his MPG too much if he keeps it off the highway. A tuner set for low octane will bump his mileage and if he wants fast, go fill with 93 and swap to the race tune.