Post a pic of which blue one you have.
If it is the long Mopar tube you are very limited on the length of the filter u can get. But if not then may I suggest the longest widest free flowing you can find. I recommend Spectre, cheap and very effective. Replaced my short little wide cone with one from Spectre, opened up a lot on the intake! Got my torque back and my mpg's and cruising speed.
Most cotton gauze filters will do u best, but most of those are the oiling type, and if not, run you some decent money.
TorRed or NoRed!
Strut Bar V 2.1
More to come...