I have take a look of my photos , but i have not good one for the temps guages

( unreadable )
Privateer are you sure for the temp ? 5000 degrés celsius !!!!

i think that must more than 500 ° celsius max for the exhaust
I am plumber and output of industrial boilers and smoke it up for 500 ° and the minimum 180 ° (not to condensation), the melting point of steel is 1538 ° Celsius