Well...on a stock 6 speed Supra...you may want to upgrade your braking system, your engine components (Pistons, Piston Rings, Cylinder Heads, Valves, Crankshafts, Exhaust System, ECUs, Suspension Parts, Tier Rods, Tires, and Transmission). I think
http://www.suprastore.com/st1015hprace.html would be your best option. 1500 Horses good enough?