K&N Filters

[07WYarisRS]

have you ever wondered why you never see a K&N filter on any stock machine?
if they were so great why don't they use them
Simple
cotton filter are the worst filter type for filtering fine dust that will cause premature engine wear.
Even K&N recommends a foam prefilter for dusty conditions

do think you car sees much dusty conditions? don't wash under the hood for a couple months and look how much dust built up collects on the engine cover, not X that by XXXXXXXXXX the amount of air you engine sucks in everyday and think about how much of that dust is going into your engine.

As a motorcycle mechanic I have seen hundreds of engines destroyed by using K&N filters. #1 they do throw off the jetting sometime lean other times they reduce the intake velocity and cause the engine to run too rich or just poorly overall. Even FI bike need to have the fuel systems re-mapped for a K&N.

for you K&N owners take a clean white rag and go wipe out the intake pipe to the manifold and then tell us its clean in there. I have shown dozens of owners this for YEARS and most people withh agree they SUCK. if the MFG could gain and extra MPG from a different air filter don't you think they would have installed it?