From sentra.net
"When installing the Hotshot header on cars with a close coupled catalytic converter built into the manifold and/or 95 and later OBDII cars, you must get an SE-R cat or a Random Technology SE-R cat of the same year and bolt it to the header collector under the car. Screw the rear O2 sensor into the bung in the back of the appropriate SE-R cat. Now extend the wire harness for the rear O2 sensor and plug the rear O2 sensor in."
So wes are you saying that I may possibly have an Se-R cat, and it will have the 02 bung already? that would be great. I looked under my car to check it out the other day and I noticed something round, it didnt really look like a cat. atleast not like the random tech one. I was trying to see if I could see an 02 bung. I didnt notice one. I wasnt looking to well either. Maybe ill take a look this weekend.
Damn, I just ran over to NPM and I believe what I saw was a resonator, Im gonna have to buy a Cat regardless it seems.