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Yea just air density. But it has more to do with affecting the timing because of the density than just saying the charge is less dense. This is less noticeable on speed density cars.
But yes. My 300zx used to spin em up through 4th gear on a cold night. Even if the tires were hot. Then on a 100 deg day it would loose a good 40 whp.
Even on my daily driver (05 gto). I loose a good 30 whp on a 100 deg day.
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