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I have had a K&N oil filter in my truck since 5K and now at 40K not a problem. It may have added something (mileage/power) but I can't tell. The only advantage is I don't have to buy filters for awhile just clean it. Chris
DO YOU HAVE ANY PICTURES OR A LINK TO SHOW. I think i know what you mean by silencers
yes there are four air silencers on the 2010 FX4 - it will make it louder if removed. No performance gain. The MAF can adjust 5% in any direction so it is a sound only mod.