^^^^ agreed there.

Do you really need a '300kw at the wheels' machine for a track car

My opinion would be to aim at a about 250wkw...the jump up to 300 is massive for supporting mods....especially drivetrain.....you should be able to get away with mostly STi drivetrain for 250 if driven with respect.

250wkw can be acheived planty of ways with many permutations.....you need to decide what size bottom end you want to use...2.0, 2.2, 2.35 or 2.5??? Me personally, i'd be going a 2.5....hell, i think youshould be able to achieve that power on a stock 06/07 STi engine.