Aleman,
Maestro is asking why you want to get rid of them to help you fix or do what you want to do.
The short answer is that the back O2 sensors are for OBD-II emission checks on the health of the cat only and do not affect the operation of the car otherwise. Many of us with '96 cars have done OBD-I conversions that render the back sensors inoperable. (FYI: Depending on the state and the emission center, you can pass emissions with an OBD-I conversion.)
If you are having a problem with emission tests or a CEL or planning an exhaust without the back set of O2 sensors, there are many options/possbilities. Give us more details.