Dodge 2013 Challenger - Manual (Page 454)

A/C Air Filter
The filter is located in the fresh air inlet under the hood,
behind a removable panel in the cowl on the passenger
side of the vehicle, next to the windshield wipers. When
installing a new filter, ensure its proper orientation.
1. Remove the access door in the cowl screen by pressing
the retaining clips.
2. Unsnap both ends and lift the filter access cover.
Access Door
452 MAINTAINING YOUR VEHICLE