My evo 9 put down 350whp/350tq on TopSpeed's dyno w/ TBE, SS O2 housing, filter, Walbro fuel pump and a tune on 93 octane. A few of the 9's they've tuned have hit the high 390's on meth.

The 07 STI looks like it will be able to hit 11's on stock turbo, just hasn't happened yet. But it appears to be just a matter of time.

BTW the IX also has a 16G. It's got a 10.5 hotside (so did the 05 VIII MR and RS) and some internal changes, but it's far from a 20G.