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Originally Posted by MikeSTI
forged vs. cast
19 psi vs. 14.5
nuff said 
not everything is apples to oranges, dont believe the hype  |
Um...
Inline transversely mounted vs. Boxer longitudinally mounted
You pretty much can't make two 4 banger motors any different. If you put forged internals and 19psi in a 2.0 Subaru motor, you surely could make the same power as the 2.5L STi motor (and probably more) but like Kevin said you'd *never* pass CA emissions.
There's a reason why the JDM Spec-C is still the better car than the US STi, and it's the same reason why we don't have it in the US... it's basically powered by a race motor!