The company here in NZ that did my auto/manual gearbox conversion on my surf did a twin turbo Lexus conversion into a 91 MR2/MX5 cant remember which , the owner of the company said they did the fine tuning on the dyno as he didnt trust any of his workers behind the wheel , the owner of the car took it for a test drive , spun it out 100 meters from the workshop , no damage came back happy , jobs now finished and road legal , owner happy