Which Water pump?

I'm a fan of FlowKooler after I had some cooling concerns. In repeated stop and go traffic in the summer, my 5.9 Magnum would creep up to 220⁰. Not terrible but when I pulled the front end (v-belt) to install a cam snout extension, I went with a FlowKooler. Now it stays at 180⁰ no problem. I had done all the normal things such as timing, cowl and radiator seal, etc before with no change.