Can 99 jeep run ok with-out catalic converter
pipe between the catalic converter and muffler
yes
in the exhaust manifold or before the catalic converter
catalic converter was removed, or needs replacing
External heat shield or internal baffle broken
It's the sparkplug looking thing sticking out of the exaust somewhere around the catalic converter
If you live in a city, state or country where emissions checks are mandatory to renew registration. Then removing your catalytic converter will make it impossible to renew your registration.
The check engine light would come on and the code stored would refer to a bad cat.
if its bogging down it could be catalic converter
In some cases blocked catalic converter
when you put too much oil: engine will lose much power oil push out and make damage your catalic converter