One more little..but important item. Any of the TwinAir filter numbers that end with "FR" stand for "Fire Resistant". This means that not only does it have the fire resistant black final layer, but also still has the other two white and orange layers..all with progressively smaller PPIs (Pours Per Inch). Tripple layers...thinner then the two Uni has but three..not just two. This most be why this filter does better then the dual stage Unifilter in many tests and is why Emerson has always said it's a better filter then the Uni.. It is a better filter. I just wish it had some internal support. Regardless, in this light, and the fact that my oversized Uni let some particles by when the oil migrated downward, I will be recommending the TwinAir 156052FR for all CFM 800s even though if allowed to get too caked-up, it might collapse. At least it won't damage the engine. You guys with Unifilter - Use the best.. most tacky oils..(I just switched to FAB-1 and it's good).. and prefilters and you(we) should be OK. I think I'll install my TwinAir in my stack can filter and put a prefilter over it. 
Ive had just the Uni for about 1-1/2 yrs and liked the fact it has a spring coil inside it but Im going order a twin air also so that I have 2 filters , ones dirty I can just switch them out instead of having downtime with waiting on the filter to dry after cleaning. Also I used Klotz filter oil at beginning and quickly realized it is garbage and literally runs out of the filter , I got Maxima FAB 1 and its the best oil ive seen , very sticky , actually hard to get it off your hands .
Im glad I seen this post , when I first start mine , I go to back up and I get a sputter and sometimes shuts off so Ill take the sensor out and clean with mass air cleaner. Thanks Clark for the heads up on this.