How to install a K&N Drop-In Replacement Air Filter on your 2010-14 GT; 11-14 V6; 12-13 BOSS Mustang

1. Remove the air box’s top cover by unfastening the security clips located on the side of the box 

2. Carefully set the cover aside and remove the existing air filter from the inside of the air box 

3. Clean any debris that may be inside the top cover and on the walls of the air box (a dry cloth works best; do not use any liquids as your air box should always remain dry) 

4. Drop-in the new K&N Air Filter, ensuring the fin on the filter is being placed in the correct position 

5. Replace the air box top cover, by aligning the two hooks on the side of the box, back in place (opposite side from the security clips) 

6. Ensure the air box top cover is sitting flush on the air box and refasten the security clips 

7. Start your car and ensure the air box cover is safely secured in place.