The My 2015 issue has a test on page 76 where they compare the Sprint Filter, the MWR, K&N, Pipercross, DNA, & BMC. They tested them on a Superflow flow bench at the University of Wales. There were 3 types, at the top were the single layer polyester like the Sprint. Then the woven cotton filters and the worst were the oiled sponge filters. Hello operator, connect me with Sprint Filter.....stat!