I had one of the first batch & paid £500 + £35 for a front pull bracket, think they may be a tad cheaper now, it really is the bargain of the century. My WRC inlet was £180 if i remember correctly so about £700 for an inlet/Plenum that appears to be best of breed. Mark was shocked & have talked to Joe so was he that he seemed to have hit on such a winner.
I also use a 14mm spacer.