Originally Posted by park308
Thanks I will probably be able to afford that one I have a 91 XJ 4.0
I forget on the early XJs if the O2 sensor is behind the cat in the exhaust pipe or in the cat convertor itself. If the sensor is in the pipe downstream, you could cut the pipe right before the sensor and put in this universal cat, which is slightly cheaper.
If your O2 sensor is inside the convertor, you will have to use the convertor in the previous link I posted.