Well I have a jdm b16a and it doesn't have a coolant heater. And I live in the dead center of the Canadian prairies. (In an Igloo of course) I'm wondering if anyone else has to deal with -40 degree celcius temperatures. And how does your engine like starting up when its that cold? Mine has always started up these last 2 years but this year I want to install a coolant heater. I'm thinking of intalling it in the heater hose or the bottom rad hose. Any suggestions? and if I install it in the lower rad hose will the water circulate or will the thermostat keep the water from circulating? thanks