We added a turbo kit to a 2.5i Outback. The interesting point about it is that because of that, I have had the experience of driving it without the turbo kit, and with. And in a general sense, the original response is still there - it's just that when it's boosting, there's so much more power/torque that whenever you make the transition from original n/a (non)power to boostedomgwtfbbq power make the transition zone *feel* laggier than it actually is. If you are at the track and always in the boost, response is there.
The other advantage is that my overall gas mileage improved, since I don't need to fang it as hard to get it moving in traffic or on the freeway.
Regards,
Paul Hansen
www.avoturboworld.com
www.facebook.com/avoturboworld