Stock, the bottom end of the 2JZ motor will withstand 1000WHP. The tranny and diff will hand 800WHP with no hard launches. The Supra was completely overbuilt straight from the factory for sure. That being said, I think America has some spot on motors made as well. Not to the extent of the Supra but I think the Supra is literally in a class of it's own in terms of stock reliability.