Mafia II :: Fastest Car in The Game?

ISW 508 or Delizia Grandeamerica (DLC)

Fastest one I've personally driven was the Potomac Elysium. I believe it had a max speed of 137. Not sure about the cars he mentioned though.

***Spoiler***

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I just use the car I took from Leone Galante's property. You know... before he makes his departure.. He has a couple of cars in his estate. I grabbed the convertible. :D