BMW i8 - For the pseudo-environmentalist billionaire in every one of us - YouTube I can't even come up with a character with this alt-mode.
Any of the Stunticons would suit this car quite nicely, with the exception of Motormaster, of course. Breakdown's a great choice.
Great potential for a brand new character. And since Bay's name won't be attached, fanboys will be okay with it! No "Bay is an idiot for making a new character! Why couldn't he just use G1 character X?!?!" They'll say "So-and-so made a new character? What a visionary!" But seriously, sweet car.