Flying at night in a Piper Chieftain, I once noticed a red glow through the air vents on the left engine cowling. It took me a while to realize that the glow was emanating from a pipe shaped object. After a little thought, I realized that an EGT of 1,525 degrees F is plenty hot enough to make the exhaust pipes glow red lol. Never gave it any thought until that night, but MAN that's hot!