It's about the same as doing a series of performance enhancements for a turbo car. Coat the p's and c's, change the valves, intake and exhaust, some wiring, testing and tuning... probly spend like 1200-1500 tops on parts and coatings n stuff, maybe another 400-500 on labor if you can't dyi, you might spend over 2300 on gasoline in a year. The big deal is keeping the internals from rusting, all the wear parts and exhaust needs to be converted to non-ferrous metals or ceramic coated, I don't know about the rings but nichrome cylinders won't rust, ceramic piston coating's and maybe chrome rings? I'll try it on my old bug once I get re-established n bills paid. Maybe it'll still have 150+hp with that setup non-turbo'd, throw in a 70 shot of nos for the drag strip.