[flyinMKIV]

In order to run any power past 400 HP your going to have to change the tranny out anyways. The only tranny that came in a MKIV supra be it auto or manual that can hold over 500 HP and not break is the v160 6 speed tranny. There really is not an easy way to do what your talking about without spending a good chunk of change.

IMO you should get an engine swap and upgrade the fuel system, tranny, turbo, and suspension. I would also upgrade the brakes as well since there's no point going fast if you can't stop fast ethier. TT brakes would work fine for you.

Engine swap : $1700 which is a J Spec Aristo motor, you need another ecu and wiring harness but it works.

Tranny build : Around $2200 from boostlogic out in Texas if it's an auto.

Turbo Kit : depends on what you want to go with but a 67 trim turbo with a proper tune would get you into the 10's easy. Boostlogic offers it at $3799

Fuel System : $1900 with 75 pound per minute injectors. Again from boostlogic.

Suspension : Tein SS Coilovers is what I run and couldn't be happier with the ride and weight transfer. Prices vary at different vendors.

P.S. I don't normally do this for people on here so if you have technical questions feel free to ask but anything else you need to do your own homework. Good luck with the build.