Eh, close.
Supposedly, the stock sleeves on F20Cs suck, just like the H22s. They are made with "fiber reinforced metal" and don't like boost so well (from what I have read). But I DO know that stock K20s (RSX motors, and have a very similar design to F20Cs) can take close to 600 horse.
I know the stock rear ends in S2Ks blow donkey asshole. And I have heard/read/seen mixed reviews on the S2K trannies. Some say they are weak as hell, some say they are indestructible, and from what I have seen, the S2K that we did that made 480ish (low boost [13psi ish] pump gas) held up just fine on stock trans/rear end. Now that car is on a bigger turbo at 15 ish psi. And is still holding up just fine.