It seems that four pipes may be the 'in thing'. On page two of the linked thread is a Leon Cupra that just had an aftermarket pipe. www.tdisport.com/Forum/topic/8204-andrewjbs-mk3-leon-cupra-280/page-2
BCS will have done that so they only need one design for the cupra and the R and the S3, but mines only got a single pipe on the end and it'll be the same design from there on back so you could change if you were an R owner feeling it was a bit too much...