I have raced with a stranger in Subbie version 8 before. From the external look (full bodykit, FMIC, GT Wing) and also exhaust note + wastegate sound, it was modified.
At take off, I have lost to it by 1.5 cars since his is manual and I have turbo lag + autobox. After the distance of 1.5 in front of mine, my Airtrek was literally having the same acceleration with the Subbie when I am on full boost all the way to 150kph when the next traffic light approached.
Yes it's slow taking off in auto (especially without launch control) but the speed increase after that is equivalent to manual car.
Bear in mind, Airtrek has handicap of around 200kgs heavier than Subbie.