I have a Harman tl300. Everywhere I've read they say when the stove kicks into afterburn it sounds like a jet plane is taking off. Mine does not do this at any temp. I get good overnight burns with a good hot bed of coals in the morning so I think mine is engaged and running right but not sure. Also the temp on my stove top drops significantly once I engage the afterburn, which I get most of the heat now is being sucked into the back for the 2nd re burn. Do I need to have the jet engine sound to know I'm burning properly? Thanks