How to Install MMD by FOOSE Rear Spoiler - Pre-Painted (10-14 All) on your Ford Mustang

Using a panel removal tool, remove the various push pins and rubber bumpers holding on the trunk lid panel. 

Remove the (4) 10mm buts securing the factory spoiler.

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Close the trunk. The spoiler is held down with double sided tape. Using a plastic chisel, gently pry the spoiler free of the trunk lid.  **Note: the sheet metal is soft and you can easily scratch/dent the deck trunk.  Once the spoiler is removed, clean any excess adhesive off the trunk. 

Once the deck lid is clean and free of adhesive, wipe down the surface with the supplied alcohol wipe followed by the adhesion promoter.

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Place the supplied (4) foam squares over the threaded insert holes as shown.  Then 

With help, line up spoiler mounting holes with the decklid holes.  Using the supplied screws and washers, tighten down the spoiler.  Then apply firm pressure on all the tape ledges.