2013-14 Mustang Boss 302 Rear Diffuser Installation Instructions

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. Release the trunk trim panel, and disconnect the trunk light electrical connector, and then remove the trunk trim panel



3. Disconnect the right, and left hand tail lamp electrical connectors



4. 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







5. Raise, and support the rear end of the Mustang with jack stands



6. Remove the 3 screws on each side in the wheel well opening at the front of the rear bumper





7. Release the center clips on both the left, and right hand splash shield



8. From under the car, remove the 2 retaining clips



9. Remove the 4 pin type retainers, two per side



10. Remove the pin type retainers from each retaining arm



11. 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





12. 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




13. 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



14. 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








15. 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




16. Use your body saw to finish cutting the slots until you have an even open line where each slot was etched into the bumper




17. Now just clip in your Boss 302 rear diffuser into your factory bumper cover with the supplied hardware



18. Reinstall your rear bumper cover, your tail lamps, double check all electrical connections, and you're all done!