Perhaps not top of the list quality... Maybe more of an honorable mention. But, the first thing that popped into my head when I saw this thread title was the last generation Toyota RAV4, with the 6 cylinder. I think they put the 6 in them between 06 and 12. Talk about unsuspecting. Certainly not blisteringly quick, but absolutely capable of surprising some much sportier vehicles, in straight line.
The current Regal GS. Not super quick. But I believe most anybody'd be surprised it's a Buick.
The Mazdaspeed 6 was unsuspectingly quick by appearance.
The Forester 2.5 XT, with the WRX engine...
The Chrysler GT Cruiser.
The 2004-2008(?) Legacy GT.
The 1990 turbo Dodge Caravan.
The R/T Dakota 360ci from the early 2000s.
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