Purolator Efficiency on Upgraded Oil Filters

I was under the impression the Boss series would do pretty well - I’ve always thought of it has as a Mann fleece filter, as found on many Mercedes in a can rated for 15K.

Now that Fram cheapened the Ultra series - is there no “real” depth media on the automotive side of things?
Still have Royal Purple & Amsoil; also, Fleetguard Stratapore & Donaldson Blue (if they make them in a size you can use). More $, unfortunately...
 
^^^ I believe the BOSS use to be worse efficiency than that in the earlier years after it came out. I'll have to see if I can find any historical info. Anyway, 99% @ 25u isn't bad, and the BOSS has nylon mesh reinforced media so they will never tear.
 
Now that Fram cheapened the Ultra series - is there no “real” depth media on the automotive side of things?
It seems like everyone is cheapening filters these days, so Fram Ultra still looks like one of the better ones out there.
 
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