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Not having a second O2 sensor will not make the front one read any different, it should throw a CEL though. I don't remember if you are using a logger or not, but if you are do some low throttle pulls and log them and see what it is doing. You can't really trust the stock O2 sensor anyway but it will give you an idea where you are. Sometimes you have to lean it out a lot to see some results, it sometimes seems like it is not doing anything but it might be that rich. So is the car missing at low throttle? When is it running bad? Is it boost related? Be more descriptive.
Just a little pointer, you should give your lists of mods to people, it will help you get answers to your problem.
Craig
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