I rode in a Korman turbocharged E28 535 the other day, while I was at Korman's place to pick up a steering wheel. The fellow who owns the car works there in the summers. His dad has had the turbo on the car since 1987 or so. He's also got the intercooler, which allows you to go up to 11-12 pounds boost, which they may or may not be able to source for you these days, he says. The car revved up real nice. I don't know how much throttle he was giving it, because I wasn't driving. If you call and ask for Shane Gunn in Sales, he'll tell you what you need to know about the turbo unit. The other post is correct; Ray doesn't like to waste time, he wants to get to the bottom line, do you or don't you want to ride fast?, and if you do it will cost you. Good luck! -Ken