Elevation damage

At standard day temperature, pressure at sea level is 14.7 psi, at 3800ft it's approximately 12.8 psi. Turbocharging certainly retains more power at altitude vs. NA, but stills takes a hit. When I was running a 64/71/14 on my 12 valve it was night and day difference between sea level and 5000 ft where my parents live.
 
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