Has only ever worked once, on an FR (proper FR, not new "FR") bumper when proper time and care was taken to bend it properly to fit.
Only works on the FR bumper because the flat spot in the middle of the FR bumper grill lines up with the dip section of the LCR splitter. On the other bumpers nothing lines up, it just looks like a piece of plastic from a different car tacked on and looks awful.
IMO of course.