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Hello FFM! This guide will assist you in replacing the cabin air filter for any 2011-2014 Mustang 3.7, 5.0, BOSS or GT500 You will need: Cabin Air Filter (Ford Part FP53 or equivalent) #2 Phillips screwdriver (Stubby) (Optional: Needle nose pliers or panel removal tool) Open your engine bay and locate the battery in the upper left corner. Remove the two red circled plastic screws. You may need the assistance of needle nose pliers or a panel removal tool. Lift up the shroud. You now have access to the cabin air filter. Push down on the filter and pull to remove. It is a tight fit coming out. Comparison of dirty and new filter. Remove the dirty filter and install the new filter making sure the air flow direction (listed on the side of the filter if applicable) and the filter pleats overlap the fins on each side of the plastic housing to promote a proper seal. Install in reverse order. Any questions please post below. -Nyke . Engine air filter and cabin air filter replacement Engine air filter and cabin air filter life are dependent on exposure to dusty and dirty conditions. Vehicles operated in these conditions require frequent inspection and replacement of the engine air filter and cabin air filter. Manual recommends 20,000 miles. I replaced this one at 16,000 miles.