98.7% at 20 microns is still great. I wouldn't pay that, though, when I can get an Ultra for almost half the cost. Heck, I won't run Ultras for awhile in my Pentastar after picking up a bunch of M1 filters on clearance for 4 bucks each. I think they are good enough at 99% at 30 microns, at least at that price. UOA's will tell the story, though. I'm sure I can sell them for what I've got in them if anything shows up that bugs me.