If you want an oiled, reuseable filter but want better filtering than gauze filters (like K&N), look at True Flow. These are foam filters, and use a stickier oil than the gauze ones.
True Flow has replacement filters, universal cone filters (to retrofit K&N, Airaid, Mean Green, etc), and systems which replace only the restrictive parts of the stock intake (like elbows, etc.). Their Wrangler system isn't out yet, but the replacement filter is.
I have used the replacement filter for three years now, and it replaced a K&N filter. With the K&N, the inside of my intake tube was always coated with fine dust. There is absolutely no dust getting through the True Flow.
I have no data on performance increase, etc., but I have saved money on filters over the years!
01 Sport, front drum brake & birfield joint conversion, custom '4 Wheel Drive' stickers, neon washer nozzles, chrome type 'r' oil pan bolts, wooden bead seat pads, racing exhaust tip, offroad license plate frame,
lots of misc. stuff (2.5" Skyjacker springs, 1" BL, 1"MML, Custom flat tcase & engine skid, RE arms, Skyjacker shocks, JKS Discos, Superlift Trac bars, Garvin bumpers, Warn 9.5ti, Lockright & trac-lock, 32" BFG KM's, Kilby & warn skids, EOR rocker bars, cowl snorkel)