Wrote this up for somebody and thought it might be helpful to others:
Installing is easy but just take your time. As with any aftermarket body parts install, test fit everything first.
-Clean the all the piece and apply double sided tape.
-Clean the bumper with some Bug & Tar remover and make sure there is no residue left over.
-Install one of the side pieces first, not the center. It should line up pretty well with the bumper's lines. Attach with just the double sided tape.
-The center piece is next. This is a key step. Peel off just enough tape
backing so you can peel it off with the center piece set flush to the bumper later on. You want to be able to adjust the center piece from side to side, so
don't fully apply it to the bumper just yet.
-Have a friend hold the center piece in place while you put the other side piece on (again with just double sided tape). The side pieces will hold the center piece in place.
-Center the "center piece" so the gaps on either side are equal and peel off the rest of the tape backing.
-Step back and admire for a minute
Not done yet.
-You will need to jack-up the car to put the screws in. The factory jack works fine if you do one side at a time.
-Using a 1/16" drill bit or any drill bit slightly smaller than the provided screws, carefully drill out some pilot holes into the bumper using the holes already on the lip as a guide.
-The provided screws are self tapping. Using a hand screw driver only (no power tools!) tighten until flush.
-All done, enjoy!