A supercharger would be easy to install on the 190e. There is a lot of room. Cost is another thing. I would estimate about $2800
installed for a basic setup with intercooler. Using a Vortech unit.

Turbo with Intercooler would be about $2200 installed and that would get you about 225-250 HP.

If you can fabricate the parts yourself then the cost would be really cheap!