Yes, you can have the ALT pulley on at sea level with our canned tuned, we are tuned from sea level to high elevation. This means a client can go up and down the mountain without issue. Our tuning follows the barometer reading and adjusts fuel/timing accordingly. Yes at sea level it will make 11psi peak and thus more power, as you transition from sea level to elevation, it will nominally make less PSI.
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