every 10,000 miles. the stock paper one does not last any longer.
You can buy any air filter you want from the 2014 hemi. both lower airbox housings are the same.
Stay away from all oiled air filters only buy a dry flow air filter.
I like the AEM
Times 2 on staying away from oiled air filters they used to gum up my intake and MAF sensor on my old gmc....plus if you let them dry out they don't filter worth a hoot