I have a Cu-Seal (copper) DP to turbo gasket I'm not using if you want to buy it. It requires a retorquing after one heat cycle, but should fix your leak.
It is possible to tune a car's boost maps to be elevation specific as WRX's have a barometric sensor that the ECU uses. I get 17 psi all day at any elevation.
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Slow and low, that is the tempo.
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