Too late on that Chee.
Pretty much you could stick with a 207 and run a fair bit of boost on a smaller turbo. Track cars are going to want decent on/off throttle response and the 2.2ltr will give it that with the proven forged bottom end. WRX motors are fine, just dont expect it to take the punishment required by a track car. Like chee said, they are open deck to start with, their internals are not forged and the heads dont flow as well as a set of v7 sti ones. Nor do they have as good cams etc.
By starting with a wrx engine, you are already a step behind and sevrel thousand dollars down. I would opt for the 2.2ltr for the 200cc more stroke to push that turbo spool a little quicker rather then the 2ltr and then throw a medium sized turbo on her. She'll be kickin tyres like no tomorrow.
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Originally Posted by chee
for 300kw out of a 2.5 that would take a beating, id sleeve it, go with forged goodies inside. that would be a good reliable setup.
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In otherwords a 257 with sleeved bores? Also from what i have read because of the TGV deletes in the STi manifolds they actually flow better. This info has come from a few sources. Tumbler Generator Valve was aparently only made to United States specefications for emmissions on cold starts. Dont know if Aus deliv. ones got them. But thats another topic!