Re: Fiat 500?
Not being rude, but how are you going to get a "sportier" engine in there? There really doesn't look like any room unless a boot-free version (like those Fiat 500s with a Coventry pump engine) is likely to sell. And if there's room, there's still the heat problem. Rear engines have a problem with exhaust positioning now you need catalytic converters.
I wonder if this was going to be an electric car right up till the battery technology didn't happen?