im not sure thats an aftermarket bumper... i think it the standard bumper cut and smoothed into the standard rev 3 splitter. wouldnt be too hard to replicate i think.
im sure thats a member on here, so maybe he'll post on this.
its really a friend of mine called tony but yes the top half is off a standard bumper but the bottom looks nothing like a rev3 splitter with the bottom has been custom fabricated then with a carbon splitter and you look at bottom corners there is a recess hole either side of the bumper matching the skirts