I wouldn't say that there are "street" supras and subarus making that kinda power. They may have plates on them, but I bet they are not very steetable (spool rear end with giant axle, etc). Now, I have seen some completely streetable 800 hp supras driving around. A buddy and I raced one in a bone stock 385 hp 'vette, and the supra surprisingly was not as fast as I though he would be. He won, but we were going way over 100 before he caught and passed us (he was probably still in 2nd gear, lol).
The supra motors are bullet proof. But, to get the power up above 800 hp, you have to spend a fortune (kinda like you do to get our motors over 800). The nice thing about the supras is that they come from the factory with forced induction, so alot of the homework is already done (i.e, there's already a mount for an intercooler up front, the computer is already set for a 2bar or 3bar map sensor, etc, etc).