I just had both o2 sensors changed on my car,now there is a loud noise between the front exhaust and rear exhaust, is there anyway this can be fixed and not replaced. I was quoted about 700 to install the rear exhaust, only to be told that I might need the front (cat converter) replaced too. He said he won't know until he takes off the rear exhaust because maybe the front is leaking too. If that is the case, I was quoted about 2,000 for both front and rear exhaust
the leak is at the ball joint