I'm in both the 370z world and the Subaru world... Unmodified on the track, my guess is that the 370z would would be faster than the WRX. The 370z powerwise is well over 300hp, the WRX is at 268. The 370 also only needs to put power down to 2 wheels, not 4, so there is less driveline loss. Weight is about the same for both.
With that said, in a "race" situation it would come down to driver, road conditions (debris, rain, etc) and tires to see who would win a race.
This is all based on road racing scenarios as opposed to drag or street.
-mike
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 '14 Touareg TDi | '04 Nissan Armada | '13 Subaru BRZ
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