The BRP cooling system does need attention in its stock form (its like it was designed to only run wide open in the desert). I added a fan, wrapped the headers with fiberglass exhaust wrap, changed out the thermostat (there is a cross reference part number for the same part that is used in a automobile which if im remembering correctly you can get it to open at a lower temp). Flushed the system and changed to fluid out with amsoil and used amsoil coolant boost. All of those things made a big difference in keeping the pig from boiling over, but the thing that needs to be done first is getting your jetting right.