i would do a moderate build up for track use. some where around 500 or so at the wheels. and if you need more on the street there's always a 50 shot. i love road racing and the supra is one of the best for that function so i would do: full adjustable suspension, 2 way diff, cage, big brakes or upgraded stockers. and a set of HKS twins to about 550hp or soo. i hate single turbo's. if it came with 2 it should have 2.