The Ford Racing filter will probably "flow more" than a regular Motorcraft. Keep in mind that the term "flow more" doesn't actually mean it will give more oil flow because engines have a positive displacement oil pump - what leaves the pump goes through the filter and oiling system. So the only time filter A will flow more than filter B is if filter B makes the oil pump hit pressure bypass at high RPM use and filter A doesn't put the pump in pressure relief. The term "more flow" when talking about oil filters really means a less flow restrictive oil filter which results in less delta-p (pressure drop) vs flow across the filter (see flow performance curve below). All filters flow the same oil volume from the PD pump as long as the pump is healthy and it's not in pressure relief.
Sidenote - The Ford Racing filter has the base end bypass valve, which a lot of Ford guys want. Most aftermarket oil filters for Fords do not have the base end bypass valve, but a bypass valve in the dome end.
Here's an old data sheet (from 2005) for the Ford Racing filter. Don't know what the oil viscosity/temperature was in that flow test shown - most likely typical hot oil viscosity based on the curve I see. Not sure if the current models are the same. Maybe you could call or email Ford Performance and find out (?).
Sidenote 2 - I wouldn't use a regular FL820S due to the reports in this forum of torn media on that specific Motorcraft filer model. I would use the Ford Racing FL820 without concern.
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