Does anyone have timeslips to verify the advantage of a K&N style filter setup? I firmly believe, unless it's a HIGHLY modded car, there is no advantage, and those style filters allow more dirt into the engine so they actually do more harm than good. The sound made by the non-muffled air intake makes the brain THINK you're going faster (like in the old days when guys flipped the air cleaner top over to get that intake howl on carbureted engines). Another issue with these filters is the oil. If you over-oil them, that oil can get sucked into the MAF sensor, ruining it ($160+ part BTW). Just for reference, a K&N filter installed in a new Duramax Diesel GM truck will void your warranty because of the two issues mentioned above.