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just a quick update on this otherwise dead thread given some information I came across while reading about x51 intake conversions. the x51 intake doesn't use a resonance flapper, and the Porsche-approved procedure when installing the x51 package is to repurpose the resonance solenoid to pse control. so, as per my post above, it would be pretty easy to set up a homemade pse with some vacuum-actuated cut-outs and control them with the resonance flapper signal - exhaust only opens up on high rpm.
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