AEM filter

I have an AEM CAI and would like to buy a "better/biger/longer" filter for it? Anyway, the way its mounted now the filter can be much longer than the stock one so has anyone else gone with a longer one? The AEM is a 2.5" tube if I remember right too so I'm guessing any round type filter that has that size connection should work... right:confused:

So I just need to know where to get one too...