Cherry Red Glowing exhaust are a sign of a clog in your exhaust system, Usually you can tell where the clog is by the location of the glowing areas of the exhaust,
If the headers were the only thing glowing.. then your cats are cloged
If all the exhaust pipes were glowing, even the pipes that hold the 02 sensors, then your muffler is clogged up with chunks of broken catalytic converter honey comb.
To verify, remove the muffler and start her up and see if that improves the idle and press the throttle to see if the RPM's pick up quickly... if its seems like a 80% improvement then buy a new exhaust and cats... or straight pipe that mofo and buy a new exhaust.
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