K&N
I use a large 6in high x 14 dia ..K&N filter with the K&N "Extreme" top. On the Dyno we saw no HP loss.. no gain tho either.
I just cant bring myself to run an un-protected carb ..with all the crap that fly's around at the track in the burnout box..pits.. ect. Doesnt take much to go into the carb and begin "munching" on parts!!
Just my 2 cents
Keith