Air filter enhancements

[Zu!]

Hi!
I was looking through the enhancements section and came across this photo. Now I'm still a little afraid to muck around with the timing and pump and all that (seeing as I just got it rebuilt) but something like this, that looks bolted on looks like something I could do for now  

My question is: What kind of improvements can I expect with a air filter like this and what recommendations does anyone have in terms of brand etc.

Thanks![/img]

[nogama3]

cant see the pic dude!