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			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.
 
				__________________Slow and low, that is the tempo.
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