Can honestly say never tried K/Dragon filters.
I have tried finer filter...... CRAP!!!!!!
Bought a K&N Filtercharger after seeing the flow differences on a bench between std paper, my old finer filter( flat panel type) & K&N flat panel & round pod (filtercharger). Works wonders easy to clean etc.
Just have to get a cold air box made so it fits inside it
Ended up with the K&N Filtercharger panel, and must say, it's made a noticable difference. Acceleration is much smoother, picks up a little better from lows revs and unless my ears are deceiving me the exhaust note sounds a tad throatier as well. My DTE was 204 after a $25 fill of Optimax, and after installing the K&N just after, was 240 with much heavier driving.
Cost was $135, but no more buying replacement paper filters so it works out cheaper in the end.