Exhaust Question
 

I have a 93 chev 305, and i want to run longtube headers, dual cats and dual mufflers but my question is, how would i go about the oxygen sensor? if so, how would i go about wiring?it has one right before the cat after the y-pipe merges into 1 pipe. would i need to install another oxygen sensor, or would i just leave the 1 on the 1 side? any help would be greatly appreciated :)
thanks

Byron