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You got a huge boost leak somewhere, surely on your intercooler piping, or your crappy chinese turbo is cracked on the compressor side ( = boost leak again)
Or your MAF is unplugged meaning it cuts down at 2500rpm, but you would have said it.
As far as the FPR goes, your pressure is supposed to be 45psi + intake mani pressure, but if you just want to test your FPR you need to unplug its vacuum line (and block it); then it will be set at 45 psi all the time.
But if your FPR was bad, you would not be rich on boost.
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