K&N filters on an S65
I'd bet, NEW stock filters vs. K&N inserts is barely a difference. People take out old dirty filters and put in nice clean K&Ns and feel a gain, but that happens with clean paper filters too, and they don't get clogged up nearly as fast as the K&N filters do.
The main disadvantage is they can get oil and dust on a MAF and screw up readings. Never heard of this happening on a Merc but have on others.




