Is there any disadvantage to turning off a front o2 and installing the wideband there and tuning the car then turning the o2 back on when done and just check the o2 to make sure its working right. I had a car the other day with no where to put the wideband since they had cats and coated headers. I just turned off the o2 in the tune and tuned the car and then turned eveything back on when I was done. I would only use this as a last resort but it seemed to work fine.