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It's been awhile since I've messed with turbos, but it sounds like a bov problem. See if you can adjust the spring pressure, the boost your making may be overwhelming it and causing it to open. Some you can adjust, some you have to buy stiffer spring for. Look at the top of the bov, there is typically a set screw and a nut.
 

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For that matter, the wrong port on the bov could be being used. Make sure if it has 2 ports, use the one on top, not on the side.
 
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