Wix 51515 filter sale on amazon.

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I think different size micron rating and by pass style and thicker case. I believe if it clogs it by passes allowing unfiltered oil through. I think. Can't remember but it made me not run that filter. BTW I run a K&N synthetic media filter as there is no pleated paper to deteriorate.
 
I bought a couple about 3-months ago. They were the regular 51515 filters - not the 51515R racing filters. The ones I received were also made in the US, not that it means anything anymore.
 
So it appears the difference is max GPM of flow 7 to 9 for 51515 as opposed to 28 GPM for the race filter. And the micron rating is different. The R let's dirt up to 61 microns through as opposed to 21 a third smaller for the street filter. Both bypass at the same psi .

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I got mine and they look the same. Doesn't say race filter and no R at the end of the number. :rolleyes:
 
I just ordered five. With Florida sales tax, $25.75.

Listing said if I ordered one, it would get here tomorrow. But my order of five won't get here until Friday. Oh well, I won't need one before then anyway.
 
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