From what i have seen all high flow filters are the same size as napa/wix/oem filters. Meaning there must be less filter material “thickness” to allow more flow. Now id be happy with a high flow filter is it was larger then the normal good quality filters. Larger would allow a thicker filter with more surface area to allow more flow. But we dont see those. What we do see is a lack of metal screen mesh and larger inlet/outlet holes. With a less thick filter. My buddy put a k&n filter on his bike and then did a 5k oil change. He did not replace filter becuase he thought it was a high quality high flow oil filter. He said he would change it at 10k. I scratched my head in disbelief and was like dude No! You need to change that K&N sooner then 5k because it doesnt have the ability to catch more dirt. I guess ill have to cut a few filters open and post them online.