Lazzarini wants to stuff a Ferrari into a Fiat 500
Lazzarini Design in Italy is known for two things: ultra-modding cars for performance and putting really huge, outlandish rear spoilers on them. Interestingly, for the Fiat 550 Italia (they're name for this new creation), they actually had to downgrade performance, but still managed to put a gigantic spoiler on anyway.
The 550 Italia is a modified Fiat 500 hatchback into which a Ferrari 458 Italia V8 engine has been stuffed. The concept of putting huge engines into tiny vehicles is not new, of course. Anyone remember the Volkswagen Golf GTI W12 650 or the Ford Fiesta SHOgun? What's new here is that not only is the horsepower versus size/weight way off kilter, but Lazzarini actually had to reduce the Ferrari engine from 570 to 550 horsepower because their calculations said that this was the maximum that a 500's chassis could take.
Not only that, but in order to keep the car from taking to the air in unpleasant ways when the accelerator is pressed, the designers had to lengthen its wheelbase by 11.8 inches and widen it by that much in the rear as well - up front it's a mere 7.9 inches wider. This takes the Fiat 500 from the "tiny subcompact" straight into the "good luck finding a parking spot now" category.
To get the huge Ferrari engine into the Fiat, of course, they couldn't just open the hood and stuff it in there. Even the straightest of shoehorns and all the bacon grease in Italy wouldn't pull that off. So they removed the back seats and put it under the hatch. Then, since air flow to an engine of that size is kind of important, they added an intake on the top of the 500's roof.