answer all of those questions in part 2, comming soon, but in short:
They rebuilt the engine from ground and up. They start off by precision welding the crankshaft to make it a solid “one piece†crank to handle the increased power. Next they machine the crank case half and install piston oil squirters which job is to keep the pistons cool under high loads. They change the overload clutch settings in the gear box, install forged pistons with 8.3:1 compression ratio which had Teflon coated skirts and ceramic coated crowns. add their fully sequential fuel injection system with lambda sensor and the ECU has auto-tune features and individual injector trim to balance out any EGT spread. And they add the turbo and turbo exhaust and tune, break in and test the engine for 99 minutes on their test bench.
They've stressed the cranks to well above 200hp, and broken a few, so they know exactly where the limits are...
More than 250 such engines have been built since 2006 and none has failed. Some has more than 1200-1500 hours. So they have a perfectly good track record!
Hope this helps?
found this on a kitfox forum. don't expect to convince nev but they seem to be ok.