Anyone able to tell me if Hitech Headers are Tri-Y (6-3-1) or 6-2-1 design?
I'm only interested in the HTH145 or HTH145SS, not the HTH087SS (http://www.hitechheaders.com.au/catalogue/ford/6/) - the difference is the size of the secondary pipe, the later is 1 3/4" while the former is 2".