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During the MY99's stint, a similar metal version of this valve was then mounted directly onto the intercooler end-tank via a 2-bolt flange. The main problem associated with all of these standard WRX valves, however, is that they leak even under moderate boost - causing a lack of power and potentially over-speeding the turbo. The standard valve is also known to stay open under verging-on-boost cruise conditions. That's when there's j-u-s-t positive pressure in the turbo system, but vacuum present in the manifold.