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Old 10-27-2010, 08:20 AM
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Bob In Ct Bob In Ct is offline
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Join Date: Mar 2001
Location: Southern Connecticut, CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
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I got this info from the Wix web site www.wixfilters.com .

Their 51515 (FL-1A equivalent) had a by-pass of 8-11 pounds and a micron rating of 21. Their 51515R racing filter had a by-pass of 8-11 pounds and a micron rating of 61.

Bob
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