hmmm. but what year has 2 O2 sensors on the cat? my cat has one at each end of Cat. could it be that this exhaust is off of an LS? I thought maybe the junkyard threw on an exhaust from some random integra just to make the car run. But that doesn't make sense either because I did the orignal exhaust work like a month or two after I got the car and everything was real rusted and seized up, no way those bolts had been touched in a long time.