True duels with o2 sensors

[Bman204]

Hello all. Ok well I'll get right to it. I own a 96 hoe with 450,000 km just turned to 451.. Never rebuilt any who. My cats were clogged so I cut them off. Now I'm running wide open I'm getting the exhaust done but my friend is doing it. How am I supposed to do the o2 sensors. I don't really understand if I need one or 2 or all of them and how it will work with duel exhaust. I'm just running 2 pipes with 2 GM turbocharger mufflers down each side of the frame to the front of the back tires. I live in Canada so emissions aren't a problem. Ive spent hours on google can't find anything. Hoping someone here has a picture or could explain this to me. Thank you.

 

[SunlitComet]

you need 4 of them and the cats too.

 

[jerryjoe28]

if you don't have emissions testing you can have a tuner teak a few things and turn your rear O2s off