Exhaust system ideas.

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PlayingWithTBI

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IMO you really want your O2 sensor closer to the head like in the collector of your header for better reaction time. It should be a heated O2 sensor too.
 

884x4310ci

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Yeah my 94 has a 3wire O2. But it is not in the manifold. It's down past the Y pipe just before the cat.
Now I am thinking about going duals as would put the x pipe to get the sensor from both banks. I would put it as close as it is now as possible.
 
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