Coming from an 05 STi, I found the same thing in terms of what appeared to be serious lag.
My 05 seemed much quicker through the gears in terms of accelleration as per the butt dyno. I did some research and learned that some of this is down to gearing. As some point after 05, "to improve gas mileage" (which is what all STi owners are looking for :dontknow
, they changed the gearing and stretched things out a little.
For example, I read somewhere that in 0 to 60 tests, whereas in an 05, you hit 5th gear with optimal shift points, in an 07, you do it in fourth. With slightly taller gearing, as you shift from say second to third, you start off at lower revs...hence it seems a little flat. I want my 05 gear box back :crybaby2:
I have a Cobb AP and stage 1 helped considerably (at least per butt dyno). And yes, you cannot share an AP for obvious reasons.