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I did not say it could not be done. Rygen did it with a turbo. Its all about how much money do you wanna spend and do you want your motor living on borrowed time. I'm always down for a killer 4.0 build, but its an arm and a leg to fund.
Rygen's setup was not your typical turbo kit. He had some serious engine stuff too. Took a lot of work and a lot of setup on the suspension. And it took a lot of driver skill as well.
Average driver with a freshly bolted on power adder to a stock 4.0 is not going to be seeing 10's for a long time if ever.
borrowed time as in the more money i put into the engine the less life its going to have?
Rygen had no intention of keeping his engine for the life of the car, he knew what he was doing was leading to the path of needing a new engine. Which he currently has.
Rygen is a freak of nature when it comes to skills at the track also :P