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Definitely the altitude. I drove my car to NC to drive various driving roads there. I went up Mount Mitchell which was up to 6,578ft and the car was pretty gutless. I had intake, header back, stage 2 tune from delicious. You can calculate your density altitude which really determines your performance. You could be at 7000ft field elevation but your car could performing like it was at 8000ft due to non standard pressure and non standard temperature.
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