Ceramic Coatings and EGT

[Clarence L.Snyder]

All the heat NOT absorbed by the piston, valve, and head (and therefore
the cooling system) is doing one of 2 things. It is producing more power
(which you want - that's why you coated the engine) and going out the
exhaust (which is normal - 30% normally goes out the pipe).
If half of the heat that normally went to the cooling system stayed in
the engine, and half of what does not go to the cooling system turned to
power you would have a 7% increase in power, more or less, and the same
increase in exhaust heat-loss. If you get less than 7% more power in
this case, you would get more than 7% increase in exhaust heatloss