2002 Mercedes Benz E320 secondary catalytic converter

The secondary, (rear) converter on my 320 has eaten it's lunch again. It was replaced by dealer under warranty around 75000 miles. I could easily cut both rear converters out and weld in straight pipe which I am seriously considering. I think the car would probably run better although I realize it would not be calif compliant. My questions is: do you think the ox sensors would be affected in a negative way? Both sensors are well forward of the rear converters and back of the front converters. From their position in the system, I don, t think it would affect them.
What do you think?
Thanks in advance for your help.