if oiled PROPERLY... they will filter out 99.9% of all dust.. if your engine had dust in the intercooler and charge piping, then its because the PO didnt know how to properly clean and oil the filter..he either used compressed air (and blew the gauze apart) on the filter, or didnt use sufficient oil...
The oil eventually migrates out of the filter and then it lets the dust through.
$5.12$12.26 with est. tax & shippingRockAuto.com
...BTW your Bieber avatar is awesome.-Malone
How does it cost more if it will outlast the car?Mine lists at $25, which adds up to a $46 K&N real fast.