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Try a different fuel pressure gauge. A Boxster normally varies between 3-4bar (40-60psi). It is more likely that your gauge is reading incorrectly than you have blown out 2 fuel pressure regulators.
As to your other symptoms:
Any CEL error codes?
Model, year, mileage?
Any recent repairs or mods done?
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2009 Cayman 2.9L PDK (with a few tweaks)
PCA-GPX Chief Driving Instructor-Ret.
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