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2013-14 Mustang Boss 302 Rear Diffuser Installation Instructions

Add an aggressive touch to the rear end of your 2013-14 Mustang with this OE Ford Boss 302 rear diffuser!

Tools Required:

  • Air Powered Body Saw
  • Phillips Head
  • 11mm Socket
  • Flat Head Screw Driver

Installation Instructions

  1. Open the trunk, and remove the 2 plastic nuts, and the 2 pushpin type retainers

  2. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  3. Release the trunk trim panel, and disconnect the trunk light electrical connector, and then remove the trunk trim panel

  4. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  5. Disconnect the right, and left hand tail lamp electrical connectors

  6. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  7. Remove the 3 retaining nuts per tail light, and push the harness grommets through the body, and remove both the left hand, and right hand tail lamps

  8. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  9. Raise, and support the rear end of the Mustang with jack stands

  10. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  11. Remove the 3 screws on each side in the wheel well opening at the front of the rear bumper

  12. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  13. Release the center clips on both the left, and right hand splash shield

  14. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  15. From under the car, remove the 2 retaining clips

  16. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  17. Remove the 4 pin type retainers, two per side

  18. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  19. Remove the pin type retainers from each retaining arm

  20. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  21. Pull outward on the left hand, and the right hand side of the bumper to release it from the body, and then fully remove the rear bumper cover

  22. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  23. Lay the bumper cover face down on some shop towels to prevent scratching the paint surface, and remove the two reflectors, and the center trim piece by depressing the retaining tabs

  24. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  25. The inside of the bumper cover has a very fine line etched all along the lower portion of the bumper cover where you need to trim

  26. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  27. Note: It's always recommended to cut slightly below the line to allow for slight movement of your hand while cutting Use your air powered body saw to trim the lower portion of your rear bumper cover from one exhaust outlet, to the other

  28. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  29. Next, above each exhaust outlet, there are 2 (per side) etched in slots where you'll need to drill a hole at the end of each slot

  30. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  31. Use your body saw to finish cutting the slots until you have an even open line where each slot was etched into the bumper

  32. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
    How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  33. Now just clip in your Boss 302 rear diffuser into your factory bumper cover with the supplied hardware

  34. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)
  35. Reinstall your rear bumper cover, your tail lamps, double check all electrical connections, and you're all done!

  36. How To Install Mustang Boss 302 Rear Diffuser (13-14) - How To Install Mustang Boss 302 Rear Diffuser (13-14)