sorry no diagram but i just installed a b-pipe on an '08 ski, so i will try and explain in words (keep in mind, cooling on '08 may be different)
if i'm wrong guys feel free to correct me...
out the right side of the pump into hull
from firewall on right side of coupler into exhaust manifold
from cylinder head, to muffler, to bypass fitting on left side of ski (there is a "T" fitting connecting the three lines, not sure exactly how the T branches are routed, maybe someone else can help out with that)
if i get bored i'll try drawing up a diagram on paint!
if i'm wrong i'm sure someone will correct me