Ok, here's what I've got:
Seal Leon LCR Splitter. Part No: 1ML 805 903
Quote from unknown member: "Cost for this ranges from about £17 plus vat to whatever the thieving gits think they can charge"
Most common/recommended fitting method: 20mm self tappers, and a heat gun to help get the ends to follow the curve of the bumper.
That's all I've got, saved it in my list of possible future mods from info found on here/through google. If you want any more info try doing a search on here, I'm sure there were a few pictures of it fitted too.