This should help the thread..... a new K and N filter runs around Id say anywhere from 80-100 plus tax.
I have a K and N filter thats nearly new that I used for less than 5000KM when I put it on my DINAN intake for my E36 M3 but then just stayed and used the stock filter when I stored my car.
This cone is very new and is reoiled.
The Part number is RX 4140 and is the skinny 3.5 inch diameter filter used by many people on the E46 fanatics and bimmerforums to circumvent tight areas behind the bumper and headlights
Ill sell mine for 40 bucks so PM me if interested.