Maybe we can eventually get something like the Corvair had back then in the 60's.
Engine displacement - 164 cubic inches
HP came in standard dual carb 80, ramp it up to 4 carbs for 140 HP, or add a turbo and a big four barrel to get 180HP
I do expect something along these lines will eventually become reality. In the Town Hall Meeting Paul Elio said that EM does have plans to eventually offer software which will allow us to unlock the full power tune for this engine instead of the detuned programming which will be used to reach their MPG standards. This alone should bump up the power about 20% to about 65 HP.
During the same meeting, and also reported other places, Paul Elio has has said that IAV engineers are working on a Turbo and EM's assembly line assembly line equipment provider, Comau, has left room in the plant layout to allow for turbo installation. I would also not be surprised to see a more advanced dual overhead cam cylinder head eventually become available for this motor.
Putting all this together means that we will likely see upgraded versions of this motor running reliably with over 100 HP and possibly a good bit more. That would really turn this vehicle into one fun ride!