STD dyno numbers are what your car out down at that exact time, on that day, in those conditions. Basically incorrect end. Colder atmosphere yields higher STD numbers that a hotter atmosphere. SAE applies correction factors to the numbers to account for atmospheric conditions, locations, etc. So as long as the car is dynoed in the same configuration in both conditions, the SAE numbers should read pretty close to each other (within 5 HP I'd say...)
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