Thanks for the picture. I bought a CSI-900C and the only water outlet is to the lower radiator. I was just trying to figure out how to route the lines to the heater core on the firewall.
i duno who else's pump would work with the heater lines. they have screw in fittings, so if you don't need to use them, just unscrew and put a plug in its place.
Here is what I got out of the CSR Performance folks.
"plumb into the other hole on the bottom of the pump. its 3/4NPT"
There are two holes on each side of the bottom to give you the option to route your lower rad hose to either side. I totally forgot about the side I had plugged.