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I thought the stock boost setting was at 13.5 (highest) for the WRX. My boost gauge last night would spike up to 15 around the 5500RPM mark. Is this just a gauge error, or could the previous owner have put in a boost controller without the dealership knowing?? I bought the car slightly used. The girl had it for about 2 months, and lost her job so she sold it back to the dealership.
 

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Variations in the climate can cause such things. Cold dry air will make the boost spike, whereas hot humid weather will keep ya from seeing 14 psi. I think the stock target value is 14.2.
 
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