A sleeper smart car. Noooo, not a Hayabusa, they’d be expecting that. Shoehorn in the best four cylinder you can find (a friend put an engine from a Paseo in his), slap a giant turbo or blower on it, then laugh as you do wheelies past your competitors.

Or if you really want to go crazy, snag a second smart engine and place it up front. Twin engine, AWD!!! :D If any in my fleet die, I think I'm going that first route.