The stock TDCi is about 8.6 - 8.7 seconds to 100 km/h, with crappy stock tires. That's about 8.2 - 8.4 seconds to 60 mph.
I figure if you can eliminate the boost cut at 4000 rpm with a reflash, then you can extend time in gear, get it down to about 7.8 - 8 flat (which would be mid-7's to 60)... that's with a stock tune. You lose 0.1 to 0.2 seconds because of the shifts, and a lot of time in first gear because by the time the tires hook up, you're past the boost cut and up at redline.
Tune it to 190 hp, get some good tires, I think 7 flat is possible... which should be enough to come
close to a stock new Impreza... as long as the Impreza driver doesn't do a drivetrain-cracking high-rpm clutch-drop...
