They offer an array of power plant configs that you can now order both in the U.S. and outside the U.S.

Honda VTEC 2.0 Liter 300hp 163ft-lbs Supercharged

GM ECOTEC 2.0 Liter 205hp 200 ft-lbs Supercharged

GM ECOTEC 2.0 Liter 230hp 205ft-lbs Supercharged

GM ECOTEC 2.0 Liter 245hp 215 ft-lbs Supercharged

GM ECOTEC 2.0 Liter 300hp 250 ft-lbs Supercharged

And if you're big into DIY, you can have it sent to you in boxes and assemble the car yourself. They're not to hard to get now, being Brammo Motorsports in the U.S. has bought Ariel and now is mass producing all the parts for the car.