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Porsche actually makes a metal valve stem cover specifically to use with TPMS systems:
[IMG]http://www.****************************************************.com/mm5/graphics/00000002/neuvalve%20stem%20caps%20copy.jpg[/IMG]
So I seriously doubt metal caps bother the TPMS system.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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