Dwight, The filter bypass allows
oil to bypass the filter media when the DIFFERENTIAL pressure across the filter exceeds the bypass pressure.
This has to do with FLOW through the filter, not
oil system pressure.
This is to insure that your engine gets
OIL in case the media becomes clogged. Dirty oil beats NO OIL.
They can also bypass for a while on a cold start, due to the oil being thicker and harder to pass thru the filter.
I have a dual remote filter mount on the front crossmember, plumbed before the oil cooler. I also ported the mount to clean up the passages for better flow. Always put your filter before the cooler as hotter oil flows through the filter easier.
One more thing, I wouldn't use a Fram filter on my lawn mower. Do a little research and you'll find out why I and many others feel this way.
I use Motorcraft filters whenever possible. I think they're made my Purolator.
Hope this is helpful.