Decided to find out from purolator, what micron rating the 99% claim was filtering. I was kind of shocked that they’re the same as the boss filters…46 micron rating. Insane
BTW - If you call or email Purolator today for the efficiency of the Boss or 20K filter, they will tell you they can't say. Wonder why, lol. If it was good, they would be telling everyone.
Of the Puro’s the Pure 1 is the best bet as long as the louvers are open. I just put one on my Mustang. . The one I took off looked great when I cut it too.