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Ok, I want to put true duals on my truck, but it only has one down stream o2 sensor. So my question is would it really jack up my pcm to run the o2 on one side?
 

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I would only worry about running the one o2 sensor, as long as it is reading the exhaust you will be fine, or if you want, you can run an x-pipe and I think you can put a o2 sensor bung on that so you are reading through both, it will read like you are running the y-pipe, but you should be fine either way.
 
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