1992 Chevy Cavalier I think its the catailitic converter

The purpose of the catalytic converter is to change any unburned hydrocarbons into carbon dioxide and water. As engines become less efficient unburned hydrocarbons and often even raw fuel can be sent out the exhaust.
Once unburned hydrocarbons get to the catalytic converter they are oxidized, resulting in the release of quite a bit of heat.
If your catalytic converter is running that hot, you SERIOUSLY need a tune-up and possibly other engine work.