I read that your tires spun on the dyno. Here at our local dyno a friend dyno'd his v6 turbo hatch on 15" street tires. The car made 700/500 whp/trq. Having the car strapped down well made all the difference. But nonetheless 486 on 15lbs is dope. So I could only imaging upper 500's to 600's coming from 22psi.
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