sam why did u move on to mpfab from k&n , what makes the mfab better or why do u like it more than the k&n?
K&N mass produces everything and all their HP "gains" are not tested true. They dyno one or two cars and figure out motors with similar displacements will have similar gains and advertise that number, regardless of what they have or have not tested. For example, a Civic 1.8L from the early 90s put out 110hp, and a Sonic 1.8L ponys up with 138hp. Dropping a panel filter or a giant cone is going to be similar between the two motors but IAT, bends/restrictions in the hose, the micron rating of the filter vs airflow will have an effect, so it wont be 9-14bhp each. With K&N you pay more for the name than anything.
MpFab is meticulous and actually tries and tests their products and put everything on a dyno to see how it reacts with everything else. They post the dyno sheet, before and after, to show the real gains, not estimated.
Also, their customer service is fan-friggen-tastic.