[madmaxx]

I agree with the Wix site but that does not mean the HP has 61 or should I say I sure hope the hell it doesnt since that is what I have been using. On a side note if you want use a filter with a larger micron rating then the FILTERMAG is the perfect solution. A coworker brought one into work, it was incredible strong. Their website indicated particles down to 2 micron!!!!!!!!! So, if you like the low dp across the filter, slap on a filter mag to get the ferrous materials.

I did speak with Royal Purple, they are working on my questions, they indicated 97% efficiency at 20 micron!! 50% at 5 micron. The big question is what the pressure drop will be because if you bypass you aint filtering.

IF the hp does have a 61 micron rating, that would explain my little dp across the filter. Who the heck would ever recommend that filter on a street motor????