Do those cold air intakes void the warranty or not?
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No. In U.S. its called the Magnusson-Moss Act. Dealer/mfgr has to PROVE an aftermarket part was the proximate cause of a failure in order to deny warranty repair.
Of course, some are still stupid/arrogant enough to try, but all a CAI does is free up the airflow to the engine.
As long as you have a properly installed filter, what can the dealer claim you did to break something?
Heck, MOPAR sells a CAI for dealers to install.
But, if you are in Corruptifornia, good luck finding a Corruptifornia Air Resources Board [(CARB)-- see **** Germany] approved CAI for anything newer than about 2007.