One thing to remember when considering correction factors, is that on a turbo'd car, elevation doesn't make "AS" much of a difference as it does with a N/A car, unless you're running the turbo to it's maximum potential.
So taking this into account, 550 WHP uncorrected on a turbo'd car that isn't running close to it's max potential means that the SAE correction to 609 WHP is going to be greatly inflated.
A true correction factor that takes the turbo into account might add around 15 - 20 WHP, not 60 WHP.
At the time I posted the numbers of 609 WHP, I should have clarified this more. Although, I have to admit, at the time that we dyno'd, I didn't really think much about this little fact.
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628 WHP 557 WTQ UNCORRECTED @ 4200 FT. ELEVATION.
"The life of a Mushroom defines perfect irony."
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