You have two sets of 02's....The first set closest to your headers play an important role in monitoring A/F ect.....you need those to be connected or you'll have issues.
The second set, towards the rear of the car are strictly for emissions only. They will not have any affect on performance if they are not connected. This is the set people turn off when adding an aftermarket x or h pipe
If your having driveability issues you might want to check to see if both sets of 02 sensors are shut off rather than just the rear set. I'm not sure that this answered your question cause I'm not clear on exactly what your were asking.
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