Originally Posted by FSU_Disco
Have you enlarged yours at all?
Yes. I have a heater that has twice the air flow and three times the heat output (measured in the vehicle). Everything has been made larger. Before and after the change, I measured the flow rates and heat outputs, both in and out of the vehicle.
It is much more heater than a 90 needs, even at -40. Would be really nice in a 110.