The only difficult part about the splitter is where you want to place it, as soon as you've done that, just screw it in. It's best to have 2 people for this btw. We used normal screws and drilled through the splitter to the bumper. The edges we obviously had to cut down, but we cut them at an angle so it curves with the edge of the bumper if you get what i mean? I held it into position and my friend looked at it making sure everything was straight and lined up and from there he drilled the 2 ends, i let go, and then just start drilling where you want to hold it!
No problems with it, i've just minor scraped it a couple of times but it's absolutely solid and won't fall off.