really recirculating valves aren't for keeping the pressure up, they simply don't screw with the fuel tune on a car that comes with a draw through MAF sensor. Any type of blow off valve or recirculating valve is only there 2 do one purpose and that is remove pressure so the the compressor wheel doesn't go into surge (which allows the wheel to keep spinning faster/longer so boost stays up) it's not recycling the pressure it is allowing the turbo to get back up to pressure faster.
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