I bought it from a another owner on the "other" forum. So he did all the hard work. Basically remove the stone guard from under the front bumper. Offer this up to the rs splitter to mark out where it needs cutting down. It's made from fibre glass and then carbon wrapped so cut it down and file away! All you need is 6 self tapping screw from the under side of the splitter onto the stone guard. Offer the whole assembly back up onto the bumper and slide the stone guard into the slots as per before. Slide the clips back over and then your done.

The only thing I would watch out for is removing the 6 staple type clips on the stone guard, get a screw driver underneath then and just flick them off. The stone guard comes in 2 sections aswell so just remember to align those in place on the splitter or else u kay have a bit of trouble re aligning it all when coming to fit it.