I'm around 320ish at the crank. Stock internals are fine. I wouldn't measure their durability by HP #'s though. There are a lot of factors that cause failure, not just how much HP it's at. I was talking to a WRX'r at a track that had rebuilt his motor with forged stuff. He's found that you can run ~27PSI of boost through the stock block with proper tuning and extras like better cooling system, etc etc. I have a few friends locally that are at about 330ish to the wheels, which makes for about 400ish at the crank. No problems. However at those levels, the stock tranny will become an issue soon.

 

Oh yeah, setup. In the order I did it.
-Hacked airbox with Perrin Panel Filter
-Greddy catback
-Perrin up pipe
-Perrin crank pulley
-Helix Downpipe
-Grounding Mod w/ 4gauge wires
-Cobb AccessECU stage2 reflash
-TXS(hyperflow) TMIC

I'm thinking about selling my AccessECU and going with a UTEC because I think I can scrape more power out with a little more tuning. TXS claims ~345 CHP with their stage 3 kit and that's pretty much where I'm at with my mods. I'm going to play with a ported stock turbo too and see where it puts me. I'm gunning for low - mid 12's in the 1/4 with a stock turbo. It'll take a few tricks to get it there. Things that others overlook in their bolt on world.