• had the car up on rhino ramps for an oil change and decided to install the Cupra lip
• removed splash shields from under the car
• cleaned up the filthy bottom edge of the bumper and the engine bay side of the splash shields
• cut 50% of the height off the lip's center posts and dremelled them smooth
• heat gunned and molded the lip to more closely approximate the curve of the bumper
• drilled a small pilot hole in the middle of every tab on the Cupra lip
• held the lip centered, and drilled through the underside of the bumper at the pilot hole in the tab closest to the splitter, driver's side
• secured said tab with a screw like the T25 torx jobs under the car (very low profile, broad heads)
• repeated above for the passenger side near tab
• continued outward from center, positioning, drilling and securing the lip with said screws
(Here is the only part that may end up being unlike what I've seen before...)
• I've never liked how there just doesn't seem to be any satisfactory way to make the lip-ends follow the curve of the bumper--not where the bumper turns the corner heading rearward, mind you, but rather where the bumper curves downward immediately before the wheel arches. It seems that most people are cutting off only the part of the lip-end that actually intrudes into the wheel-well, but I decided I would cut the lip-ends off immediately after the penultimate tab (about three inches before the wheel-well). Naturally, that tab itself got a pilot hole, bumper hole, and securing screw.
• I also angle-cut the side of the lip at that point, in an effort to effect an acceptable transition from lip to bumper.
• Lastly, I replaced the splash shields with above mentioned screws at all original clip locations (I had also pilot drilled through the bottom of the Cupra lip in the few places where it was obscuring the splash shield clips).
* This install was not really difficult at all (i.e. I feel 100% confident that I could replicate this process on another car, without a hitch), but it was time consuming (2.5 - 3 hours), because it was the first time I had installed a lip, because I'm ultra-anal about getting it *perfect*, and because, although I was using a Dewalt cordless drill for the pilot holes, I was driving the securing screws in by hand, with a screwdriver. One drill for the pilot holes and another for driving the securing screws (at a *low* torque setting, to eliminate the potential for stripping out the bumper pilot holes) would have expedited the job significantly.