I have thought about doing just that, one full flow and one bypass filter. I did a little research and remember reading something about needing a restrictor or something in order to make it work correctly.
Any info on what would be needed would be appreciated.
My remote mount kit takes M1- 301A filters so 3/4 - 16 threaded filters.
The easy thing to do is to install 2 Fram Ultra oil filters. They filter better than the Mobil1 filters.
Fram Ultra does 80% of 5 micron dirt (4548-12 tests) using the double layer of synthetic fibers. A Mobil1 oil filter is a single layer of paper filter with I think some glass fibers or resin to enhance it some, but it doesn't perform near as well in the small sized crud area like Fram Ultra. (Ultra does 99.5% 20 microns too.)
In a parallel flow arrangement like that, the pressure drop on both filters is the same, and an Amsoil Bypass Oil Filter would flow less at the same pressure drop anyway, with higher resistance as it is. I'd guess you would get 1/4 flow thru the bypass, and 3/4 thru a Fram Ultra side-by-side the way you have it.
A restrictor on the bypass oil filter side would mean you could get that to 1/10 flow thru the bypass, something like that.
I think you could skip the restrictor. Sure you'd get more flow thru the bypass oil filter without a restrictor, but it would still filter well. Pick up more of the 2 micron stuff quicker. The fear is it would get plugged up early though. Even if it plugs all the way up, you would still have the full flow Fram Ultra next to it always doing its job, so I say No Restrictor.