I have a strict no refund policy over propaganda .. ! LOL... I thought everyone new you sacrifice "some" filtration for freer flow. I guess Needswings should start offering paper filters with the intakes they sell. If you do oil field work and drive 10 miles of dirt road following trucks .. I'd be concerned.. or Texas dust storms.. I'd be worried. K&N wouldn't have stayed in business this long if enough fine dust got in to ruin engines.