Why didn't you just turbo it for more horse power and the sweet noise. 220hp is weak sauce.
A turbo doesn't suit the characteristics of the car, as a drivers can a smooth power delivery is more important. Add to that no one that I know of has turbo'ed that engine, being mid engined and in a confined space heat is always going to be a problem and the fact that Lotus quite clearly think a supercharger is the best option for this car only leads to one conclusion.
It's only staying at 220bhp for testing purposes for a couple of months then the supercharger is being swopped, chargecooler is going on, new rods, cams and head and then I'm looking for 300bhp or maybe a bit more.