Heres the deal, just replaced the cat on my 1303 intrepid with a condar unit and installed a digital probe, yea i know im eat up with it as my wife says. First fire today with outside temps around 44 deg f. after getting stove top to 450 deg engaged damper and probe went up to 1350 degrees in a couple of minutes, keep in mind this is reading gas temp about 1/4 inch from cat outlet. stove pipe temp was 500 degrees when i engaged cat. i slowed the primary air after about 5 min and stove settled at 550 and digital reading is steady at 950 deg. cat is definatly working looking at chimney outside nothing but heat coming from cap. this is fun stuff for an old jet engine mechanic.