Hey, ok guys you've been wondering so here it is a Diy for the home depot lip for a sedan (will work on coupe).
--supplies- garage door sealer, double sided tape 3m, box cutter, screws, and drill
1) start by getting underneath your bumper (if you have jacks use them) and place the top side of the sealer flush with one side of the bumper. Drill a screw at the very end of the bumper. This is your starter piece
2) next start drilling screws along the underside of the bumper making it flush. Drill a screw every 2-3 inches.
3) when you get to the bend or curve make a v shape slit at exactly the point where it has to curve.
4)continue to drill screws in the same fashion, and make a slit when you get to the next curve. Then cut off excess garage door sealer liner.
(optional)
5) with that remaining liner cut out shape that resembles this shape (v) Next make one the exact opposite angle. Also make sure they are the same length
then use the double sided tape and apply it to the back side of the new small strips (look closely at the picture!!! this part maybe confusing). Next apply the tape to the lip on the car, carefully remove the backing of the tape as you apply it, don't rush.
6) then your done yeah!!

well i hope this helped... and maybe its good enough to get sticky'd, ren huh huh