My brother bought the drop in Amsoil Ea airfilter, the blue one, I think it is micro fiber or something, supposed to be really good. He has the same truck as me, but a 6 spd 2wd, anyway, he installed it about 3k miles back, and his filter minder is down around a third to half way. I popped out the filter and it looked really clean. I bought the True Flow foam air filter for my truck a long time ago, I have probably put close to 20k on the filter and my filter minder has hardly moved a couple MM, I pulled it out recently and it was packed with gunk and dirt. End result is that the True Flow flows better even packed with dirt than the Amsoil with almost no dirt. I still haven't cleaned the True Flow, because my filter minder is still at the top of the green.