Really. So no bypass in the dome in the pictured MP10575, and as found in ACDelco for GM vehicles and several of the current ST including but not limited to 9688? Even 'if' it's silicone, a step backward 'imo.' Surprised to read the blue seen is a combo valve
As for "....99% at 30 mics? So that would roughly be 95% at 20 mics?..."
Admit I'm not much on filter efficiency extrapolation, but 95% 20 um would seem extremely generous to me. For me, 'if' efficiency was a priority, I go with one that has a corresponding beta @ 20um or ISO 4548-12 @20 or 25um. That said, many/most OEM OF give no efficiency spec at all.