Well, lets get a list going of the intakes.
- Airbox mod
Seems around the community that Injen is the favorite, mostly because it can function as a SRI for people who are afraid of hydrolocking, and also as a CAI.
I can speak on behalf of the K&N and AEM Intakes for the 2.4 as I have used both of them. AEM offers a dry flow filter claiming to never throw a code. The K&N is the only intake specifically made for the LE5 (2.4) motor and comes with an oiled filter. Many ppl stay clear of the K&N filters for fear of throwing a CEL, but in the 6 months I had mine on, never threw a code. IMO, an intake is an intake, just depends on if you wanna go custom or name brand, cause thats all youre buying.