Parts List

Wiper Delete Top
Wiper Delete Backing
O-ring seal
M8 x 1.25 nylon nut
(2) Push in Bumpers
(3) 4" Zip Ties
(3) 6" Zip Ties
Set of 3 different sized Rubber Washers

Tools Needed

Rear Wiper Removal

Pop off the wiper spindle cover.
Using a 12mm Ratchet, remove the nut holding the wiper assembly in place.
Note: At this point it's a good idea to use a permanent marker to mark the spindle and wiper arm to allow for easier re-installation in the future.
Remove the wiper arm, sometimes on older vehicles a small puller can be a big help.
Note: Be very careful that you don't break the windshield prying against the glass or letting the arm snap down quickly. The one used in the picture is a Lisle Tool 54150 Battery Terminal/Wiper Arm puller
Flipping over to the inside remove the strings connecting the package tray to the rear hatch.
Next up, pull out the center section of the ball socket since it's actually a clip, then remove the lower half using your trim tool.
Carefully remove the Center section of trim by working from the outside ends towards the inside and gently pulling outwards.
Remove the trim clips holding the side panels on by popping out the center of the rivet first and then removing the base
Now you can go ahead and remove the side panels
Go ahead and remove the handle in the bottom of the door trim by gently prying outward with your trim tool
With that out of the way the only things holding the main rear trim panel on to the hatch is the pop clips on each corner under where the side panels were.
Work around the sides slowly to pop the hidden clips holding the trim panel to the car and remove it from the car
Unplug the harness from the wiper motor by gently depressing the tab
Using a 10mm socket remove the 3 bolts holding the wiper motor to the car and remove the entire assembly.
Using your fingers carefully remove the grommet from the glass.

Installing the COBB Rear Wiper Delete

Using a 13mm socket run the plastic nut down the threads on the delete and then remove, this is to loosen the threads a little bit to make getting it started by hand a little bit easier.
Clean the rear glass on the outside to improve the quality of the seal.
Install the o-ring into the wiper delete (a small amount of silicone lubricant on the o-ring can ensure a tighter seal later.
Install the small end of the rubber bumpers into the hold down bar.
Next up you'll slide the appropriate rubber washer on to the threads. This helps eat up the space between the delete and the glass and makes it easier to keep centered. For the Mazdaspeed you'll use the largest one.
Holding the delete in place with one hand, get the bar on the back with the flat side of the bumpers towards the glass, and start slowly tightening the nut.
Once it's close to tight, get the logo angled to your liking and tighten it down. Tightening more can make it look more flush but be careful not to over-tighten or it can shatter the glass.
Once you're happy with the angle and it's tight, you can zip tie up the wiring so it doesn't rattle.
After trimming the excess off the zip tie you can reinstall the interior in the reverse order of removal.
You're all done! Go out and enjoy!