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Old 02-13-2009, 12:24 PM   #2
roadracer311
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Join Date: May 2007
Location: San Francisco, CA
Posts: 218
The metal filters have paper inside. The insides of a normal spin-on filter look a lot like the paper element of the Porsche filter.

Other than being able to buy less expensive spin-on filters at a local parts store, i'm not sure what the advantage would be.
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