I spent some time with the link listed above..then got bored. One person mentioned that no makers use K&N, etc.
We all know that the 10HP increase for the Gen 2 ACR was thanks to smooth filters and K&Ns. If Chrysler thought there was a concern about filtration with these filters, I doubt they would have installed them. Remember, we started with 450..and got 10. Not a huge percentage increase.
Here's my .02. The filters themselves aren't going to make a big difference. The FIPKs are a bit different. In turbos or supercharged engines there is a better increase. In my former 03 Cobra, it was something like 30HP on a 390HP engine. Yet on my V10 Excursion with an FIPK kit, K&N says an 8HP increase. I can't imagine noticing such a slight increase. (A diesel fares better with a turbo)
My understanding was that the K&Ns filter better than paper, and I'd imagine there would be lawsuits like crazy if the filters did not do as intended.
I did the smooth hoses and K&Ns on my 2000 GTS when it was new. My 96 RT has the smooth hoses, but I have yet to check the filters. (But it's now on my list)
Back on topic...I think the whole CAI thing is over blown, and I wouldn't expect a huge change in any way on the Ram. In fact, in both my Lincoln and Excursion I have installed ScanGuages. In both cases the factory intake temp is always within a degree or two of ambient temp. What would a CAI do?