few vids of hendersons Y pipe,sounds lots better in the flesh.
http://www.youtube.com/watch?v=QNBNLC2TaRU
http://www.youtube.com/watch?v=u_bQbnbQIHU
http://www.youtube.com/watch?v=NEZorzUeBok
http://www.youtube.com/watch?v=VUVgNmmm9gA
http://www.youtube.com/watch?v=ComB_YC-4lo
http://www.youtube.com/watch?v=2Bxl5JM25hs
http://www.youtube.com/watch?v=QNBNLC2TaRU
http://www.youtube.com/watch?v=u_bQbnbQIHU
http://www.youtube.com/watch?v=NEZorzUeBok
http://www.youtube.com/watch?v=VUVgNmmm9gA
http://www.youtube.com/watch?v=ComB_YC-4lo
http://www.youtube.com/watch?v=2Bxl5JM25hs