I never spoke to a rep but I think it is stated on the box. It is cool that you were able to speak to a rep.
The filters I Noted are also close to an inch, inch and a half deeper than stock filters.
I have always run Larger filters (via cross referencing inlet since and OD Gasket size since my first 350 chevy. I would run the two quart filters and a deep sump oil pan on a short bed half ton Van. The van had some head work, headers, intake, carb and full MSD ignition. It ran like a scalded gorilla!
Quote:
Originally Posted by sh0rtlife
FWIW
the wix "xp" filters have more filter material in them with the design specificly to flow more oil thru, they are ment to only be ran with synth....spoke with a rep in great detail about them..its something like 1 extra pleat for every 2 in the filter...the idea is to add 1/3rd more surface area for filtering and allow more oil to flow thru them faster
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