you dont need a built 4g63 until you get WAY up there. a maxed out evo3 will work with a stock 4g63. but thats probably how much they support. so when you hit 380hp, they get inefficient. lets take the big 16g TD06-16G (large) 365-385hp @ 24 psi-365 with basic supporting mods and probably 385 with a bunch of other mods. im guessing thats what it is. and thats to the wheels