sleepers....how fast and how plain before it is one?
While not fast by any stretch of the imagination. I bolted a GM Performance Supercharger onto my daily driver 2004 Pontiac Vibe (Was essentially a Corolla/Matrix). Only ran 8 lbs of boost (w/Piggy Back ECU, CAI and Pulley) but was enough to take it from a measly 109 whp to just under a measly 160 whp. Base ran 17.91 and the best with the blower was 15.80 with limited/no traction off the line. Slow by anyone's standards for sure, but it did surprise some "faster" cars on occasion from a roll. With the stock exhaust it was very quiet until I floored it and the blower whine sounded like a bunch of pissed off bees LOL. Certainly made my 45 min-1 hr each way commute to work much more enjoyable.
So I guess it could maybe be called a sleeper. Especially with the two car seats in the back!