you'll cook the jet coat off? hello, jethot is in your words "Jetcoat is there to keep the heat within the pipe. It is a ceramic based material. By keeping the heat in, you heat up the engine compartment less as well as transfer most of the thermal energy to the turbine."
then u say
"The turbine is a superalloy (or ceramic) which is very resistant to heat."
how can u cook something that is very resistant to heat... remember, they put ceramic in a kiln and fire it... can withstand serious serious heat.