How do I change the diaphragm on a Cayenne 3.2? Why are the 4.5 & 4.8 motors getting throttled? 

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How do I replace the KVGV (crankcase gas venting valve) diaphragm on a Porsche Cayenne 3.2? How to replace the spring of the HVAC (crankcase ventilation valve) Porsche Cayenne 3.2? Why is the Porsche Cayenne 4.5 & 4.8 engine bumpy?
A list of the crankcase valve diaphragms for Porsche Cayenne engines:
For Porsche Cayenne 3.2 (M02.2Y):
Porsche 95511076500 Valve & Hermann HR95511076500 (Hermann 07D103245F) Diaphragm
For Porsche Cayenne 3.6 (M55.01):
Porsche 95510513501 Cover & Hermann HR95510513501A Diaphragm
Porsche 95510513500 Cap & Hermann HR95510513500A Diaphragm
For Porsche Cayenne 3.6 (M55.02, MCE.YA):
Porsche 95810513530 Cover & Hermann HR95810513530A Diaphragm
Porsche Cayenne 4.5 (M48.50):
Porsche 94810513107 Cover & Hermann HR94810513107A Diaphragm
For Porsche Cayenne 4.8 (M48.01):
Porsche 94810723601 (through 2008) Valve & Hermann HR94810723601 Diaphragm
Porsche 94810723602 (until 2008) Valve & Hermann HR94810723602 Diaphragm
Porsche 94810723603 (from 2009) Valve & Hermann HR94810723603 Diaphragm
For Porsche Cayenne 4.8 (M48.51):
Porsche 94810723652 (pre-2008) Valve & Hermann HR94810723652 Diaphragm
Porsche 94810723652 (up to 2008) & Hermann HR94810723652 Diaphragm
Porsche 94810723653 (from 2009) & Hermann HR94810723653 Diaphragm