Like the other guy said the 4th generation supra was the best.
The supra in the first F&F movie was actually mostly exterior mods and was only pushing around 400 hp without the NOS.
The supra from the first race in the second F&F I actually came across on a random search before the movie came out.
In that supra they actually swapped out.... yes... swapped out the 2JZ engine and put in a 3s-gte like you would find in a Celica GT-4 or MR2.
It's only a 4 cylinder but its much lighter and it had around 800 hp. I'll look and see if I can find the link.
ADD: Here we go.
They took the 3s and stroked it out to 2.2L and the car has 720 hp
http://fast-autos.net/vehicles/Top_S...2/GT300_Supra/
Sweet ride.