I didn't find anything other than for the trailer hitch for the 2011+ WRX Hatchback...so I thought I would post this here, not sure if it would help anyone but won't hurt. I am mounting this trailer hitch to haul my mountain bikes with the Yakima Holdup rear platform hitch mount.
OK. This is my first attempt at a "how to" and is not super detailed but more to reflect how much effort is required for the installation. The directions stated that it should take a mechanic 25 minutes or a novice 50 minutes to install. I say allow yourself 2-3 hours for the installation to do it right.
Car - 2012 WRX Sedan
Hitch: Curt 1 1/4 Trailer Hitch part number 11317
Note: HIGHLY RECOMMEND 2 PEOPLE INSTALL THIS DUE TO THE WEIGHT AND NEED FOR A SECOND SET OF HANDS
Step 1. Jack up car
Step 2. Drop exhaust by removing the (5) rubber exhaust hanger bushings (2 on each muffler and 1 on mid-pipe)
Step 3a. Remove rear bumper from car by removing the 2 clips on the lower undersides, 2 clips under the rear, and 2 clips at the top of the fender well where it meets the body. Be careful removing all clips and keep them someplace safe. The rear bumper will basically unsnap along the top under the lights by gently prying it off. If necessary, take a small screw driver and apply pressure from behind the bumper where the trunk liner is located (note: I removed the trunk liners for this but it is not necessary to remove them all, only the plastic piece at the trunk and the lower portion needs removed).
Step 3b. Remove the rear bumper support by removing the 3 14mm nuts from each side.
Step 4. now the area where the hitch mounts will be able to be accessed in order to fish the hardware through. Follow the instructions from Curt. http://sitepro12.sitepro.com/masterl..._11317_INS.pdf
Step 5. Once the hardware is in place, I used duct tape to secure the lower bracket plates to the trailer hitch to allow everything to line up just right. Tighten the nuts and torque them to the required specs in the instructions linked above.
Step 6. Take a look at that hitch which will be almost invisible once the rear bumper support and bumper are re-installed.
Step 7. While the bumper is off, might as well go ahead and re-hang the mufflers and mid-pipe. I used a little WD40 to grease the skids, so they say.
Step 8. Put the bumper back on the way you took it off, be gentle with it and it will work right into place. Be sure to put all clips back in. The two that go under the rear bottom will be blocked by the Curt hitch...it was a bitch, but I managed to work both of them in with some elbow grease and back side of a screw driver.
Step 9. Admire your work
Step 10. Try to see it from the side...it really is almost hidden, you wouldn't know it was there unless you were looking for it.