'04 CLK55 AMG.
I'm fairly sure it would be the quickest car even if it were a CLK320, although then our other car ('96 850 Turbo) would give it a run.
My family doesn't know the joy of doing 0-60 in under 8.6 seconds - thinking of as many relatives as I can, the quickest car is my mother's '03 Mazda Tribute, although my uncle has an '04 QX4, with the 3.5 not the 3.3, and a cousin once had a 91-96 300ZX.