Download Installation 1. Attach the template to the arched section of the rear bumper. Secure the template with strips of tape. 2. Mark the rear bumper along the outer edge of the template with a felt-tip pen, and lightly center-punch the four marks on the template. 3. Remove the template. While wearing eye protection, drill a 10 mm hole through each mark you just made. Using a drill stop on the end of each bit, first drill with a 3 mm drill bit, and then finish with a 10 mm drill bit. 4. Using a hacksaw blade, cut the rear bumper along the lines you made. After cutting, remove any burrs from the edges of the cut section. 5. Using a drill, drill one 3 mm hole through the lower dimple on the rear bumper on each side. After drilling, remove any burrs from the edges of the holes with a file. 6. Slide a spring nut over each hole. 7. Attach a strip of masking tape to the end of each adhesive backing, and peel back 1-1/2 to 2 inches of the adhesive backings. Fold the ends back, and tape them to the front of the rear under spoiler. 8. Using isopropyl alcohol on a shop towel, clean the rear bumper where the rear under spoiler will attach. 9. Remove and discard two (four, if equipped with a rear inner fender) self-tapping screws. Position the rear under spoiler on the rear bumper, and loosely install the four self-tapping screws. 10. While applying pressure to the rear under spoiler, use a felt-tip pen to mark the rear bumper along each hole edge in the bracket on the rear under spoiler. 11. Use a pushpin to make a hole through each mark you made.