Currently running a BMC panel filter, in stock air box, but after reading about the smoothed air box mod, with a cold feed, I'm going to try that when I can get round to it.
Having had induction kits on my 2 previous cars (Prelude vtec) although they sounded awesome, I found it a bit wearing, after a while, also I not entirly convinced there are any decent performance gains to be had for your £200 over the smoothed AB, from what I've been reading on other threads.
The other benifit is a stock looking AB over an induction kit is insurence friendly, should you have any little problems, like stacking you car into something and you didn't tell, you had modded it...