on my last 300c a 5.7 ltr and i put the Mopar CAI on and when I got a custom tune using the predator we found the biggest restriction was the CAI so i just went back to the OME one and it works jaunt as well if not better. Just my 2 cents worth.Than the factory intake? I'm thinking the stock intake will be good unless you have big mods.
In case you were wondering about the mods I had they were as follows.
SRT 6.1 headers open up to allow better air flow, hi flow cats, Corsa Sports system the Mopar CAI and of course the Diablo. So all mild mods.