I have had an 1.4 75hp engine with a turbokit from germany, within the first month the gearbox was broken, the number 4 gear was gone. Then within 16 months the engine was blown. broken rod en a crack in the rear side of the engine. My advise is to always prepare the entire engine because the standard engine isn't strong enough to have turbo power even if you drive it sensible like i did :-(