Recently old exhaust on my 91' 3.4L mod. Trooper stared falling apart so I figured that improving gas flow would be the focus of the new system
I just got back from a muffler place with an estimate for whole new exhaust,turns out that for couple extra bucks they can put in a true dual exhaust no problem. I got thinking about it and realized that dual exhaust will isolate right exhaust bank air injection pump.
My question to all you gurus out there is how will this affect functioning of an O2 sensor which will have to stay on the other pipe now cut off from that extra flow of fresh air.

Overall project involves 2" pipes all the way back with the couple of high flow mufflers, no catalytic converters. ( yes I do live in a place where emission control checks are not mandatory just yet)