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I did the google thing before the original post-results were a mixed bag but favored your comments .
The easy way to resolve was to ask someone who has them -which was the purpose of the post .
Powerflex claims they have solved the traditional (NVH) problems with newer compounds ..............the only way to find out is to try them or find a user .Absent validation- looks like it will be Porsche parts.
Thank you for taking the time to respond.
Dave
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