toyota supra rear-end max hp

[zmzmzm]

I was talking to a toyota Specialties shop guy and he said that to never put more than 300 hp to an '86-92 supra rear end or u will have no rear end. but ive seen supras in that year with well over 700 hp. how r they getting that much hp without shelling the rearend. and even if they get the rear to hold up can the trans stand that much hp too? i guess i just want to know how to get as much hp as possible out of both the rearend and the trans. does ne one have ideas?
(i also posted this topic in the road racing and autocross section)