Is it possible to swap Impreza STI GC8 engine with the cosworth engine?

I have heard/seen people having cosworth engines running in their subarus producing 600bhp..
Is it possible to swap the GC8F engine with the cosworth engine?
Short answer is yes but I'd assume since you said GC8 you're running a turbocharged EJ20 of some kind already. You already have a good starting point, most of us in North America switch to the motor in your car already.
If you want to





@ @ @ Ah but McLaren use Mercedes KERS, designed for Merc Engines whereas MVR using Cosworth engines
@ don't agree with that one. More development = more costs = more expensive engines. Bye bye Cosworth, Bye Bye Pure!
RT @: @ if any development. Where are the days of Turbo V6s taking on V12s or village idiots with Cosworth DFV engines?
LOL www.f1pulse.com made a mistake : the team (Lotus) will switch from Cosworth to Renault engines next year (2012