Very close to picking up an 06 Chrysler 300c with 80k miles. No stranger to hot rods but any specific first beneficial upgrades? The exhaust seems pretty well designed. It may benefit from some extra air on the intake side.Not looking to be Ricky racer just looking for suggestions that work on these cars.

You might find this forum helpful:

https://www.300cforums.com/

Messing around with the air intake parts rarely does much. Getting a tune done on it is the easiest way to get more power.
I haven't followed that hemi much even tho I have an 04 but on the newer ones people are using the cam and intake from the bigger one, usually while they already have it apart from lifter failure (which those older ones usually don't get).

CAI, cat back, and diablosport predator are the usual first steps. Not necessarily in that order.