Ok another Update ,
Ive used 1/2 a tank at the same mileage as when i had the sensor hooked up,Ive had no CEL to speak of & the runners is more responsive.

 

I blew my o2 sensors out about a year ago and have yet to replace them. I put a cherry bomb in place of my cat, and it killed the rear sensor, then the front. Now about a year later I ahve trouble starting the car. There is no "closed loop signal." I gotta contact gadget for a new set of sensors and the sesnor thingy that make the ECU think that the cat is still installed.