If I was thinking about upping my ELIO into a monster, which I am not, I would just try to swap the Elio engine with a different power plant.
The Elio engine is designed for mpg, not mph.
For those where mpg isn't an
issue there is always tweaking
theCPU yourself.
http://www.speedhunters.com/2015/03/project-ecoboost-more-power-more-noise/