Ok so I am new to wide band O2 measurements and using them to tune. Motor. Seems like I would need two channels for my duel exhaust set up. Right? Or at least two bungs one right one left for each side, then swap plug and sensor?
Unless you're doing something serious like a highly boosted application you should be fine with one. If you're not good with a welder you can just take the bung to an exhaust shop. Any half competent exhaust guy can add a bung to the collector.
I love using an O2 sensor. Particularly helpful if you're working on setting up a lean cruise mixture, and jetting to achieve proper power ratios under open throttle.