It is hard to put a price tag on 1 off performance parts. I have $10,000 to $15,000 in to my turbo-kit over the past 2 years. As we speak my kit is being re-done with new intake manifolds, intercooler, intercooler piping, turbocharger and downpipe. It would probably be cheaper to buy one already done if there was such a thing. As of right now I think I am the only single turbo and there is a twin-charged SRT-6 and I think a few STS rear mount cars.