I just installed one on my Comp. I cannot stress enough to read the directions at least twice before doing anything as a simple miss step can really mess up your day. That being said, my install was super easy and I plumbed in off the cooling line going to the port exhaust manifold and haven't had any issues yet. The reason for tapping in the port manifold line is that the water needs to come downstream from the thermostat and the port line had a longer run on between the manifold and the thermostat housing.
With any questions, you can always call Skidim and ask for Vince.
'86 Comp TS6M - Reborn 2016
Riding a HO Sports CX Ski