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One thing you could check is to make sure you have your lines run correctly to and from your FPR. Sometimes it's easy to get the lines botched up in which the vaccum line should feed into. This would cause poor boost conditions also because your engine isn't getting the proper fuel adjustments. This happened to me once on the stock FPRS and it actually created another huge boost leak instead of capping off as a one-way vacuum. You could blatently hear the leak until I switched the vacuum lines around the correct way. Check those too. Check ANYTHING that has a vacuum line. ANYTHING that comes off the throttle body or your intake manifold. Check ANYTHING connect to or stemming from your intake pipe, interooler pipes/hoses, and turbo. Even check the intercooler for some sort of bust or leak.
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