Quote:
Originally Posted by massmike
Stock exhaust, except the catalytic converter has been removed and replaced a bypass pipe. Once thing I did find a bit strange was the location of the stock O2 sensor location, it only reads one bank of cylinders. I mounted the wideband sensor a few inches past the collector.
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That isn't a stock exhaust.
As someone pointed out, the OEM sensor is in the wrong place.
Try swapping the two and see if it makes any difference.