Ok, I'm planning fall already, since we're socked in with wildfire smoke. The oil filter questions got me going again, so I started looking up premium oil filters for Ram 6.4L Hemi Engines. I went to individual part pages to gather these data. Remember, nobody publishes filtration media surface area these days, so this is a GUIDE to use for relative media sizing, the goal being lowest flow resistance while retaining good filtration contaminant efficiency.
All of these filters have the same spud threads 22mm x 1.5mm, all have an anti-drainback valve and a pressure relief valve. All have synthetic media of some sort.
Stock Filter recommendations: (similar canister volume)
Fram Ultra XG10060
Gasket I.D. 2.45 in.
Gasket O.D. 2.76 in.
Canister O.D. 3.00 in.
Canister Height 3.33 in.
Royal Purple 10-48
Gasket I.D. 2.350 in.
Gasket O.D. 2.720 in.
Canister O.D. 2.980 in.
Canister Height 3.400 in.
Extended Length* Filter recommendation (long canister, same diameter)
Fram Ultra XG10575
Gasket I.D. 2.454 in.
Gasket O.D. 2.756
Canister O.D. 2.984 in.
Canister Height 4.06 in.
*added canister surface area +23% compared to stock filters
Royal Purple 20-500
Gasket I.D. 2.350 in.
Gasket O.D. 2.720 in.
Canister O.D. 2.980 in.
Canister Height 4.500 in.
*added canister surface area +32% compared to stock filters
Extended Length & Diameter* Filter recommendations:
Fram Ultra XG2
Gasket I.D. 2.422 in.
Gasket O.D. 2.813 in.
Canister O.D. 3.656 in.
Canister Height 3.984 in.
*added canister surface area +44% compared to stock filters
Royal Purple 20-820
Gasket I.D. 2.420 in.
Gasket O.D. 2.810 in.
Canister O.D. 3.650 in.
Canister Height 3.750 in.
*added canister surface area +35% compared to stock filters
Mopar SRT MOP-05038041AA (data from Summit Racing Catalogue)
Gasket I.D. N/A
Gasket OD. N/A
Canister O.D. 3.650 in.
Canister Height 3.650 in.
*added canister surface area +31.5%
Notes: (1) in terms of surface area increase, this approximates the amount of % media area increase on the larger filters. (2) the Mopar SRT filter is the lowest surface area increase of the aftermarket filters, and therefore nothing special regarding this parameter (3) The oversize, larger diameter filters provide the most additional surface area, with Fram XG2 the clear winner due to the larger diameter and longest barrel length. (4) Royal Purple's biggest filter 80-820 provides only 3% more surface area than the long canister 20-500 that is easier to install. (5) based on all of this, I still recommend Royal Purple 20-500 for 1/3 more filtration area while retaining ease of installation.