Got it, four wires, in front of cat just below the exhaust coupler, $30 plus shipping, we'll call that $5 as a guess. PM me an email, I'll send you a paypal link. Gonna cut the pipe about 3 inches from each side of the bung if you want, give you plenty to add in.

 

So the o2 will have the factory sensor plug on it too? I will let you know something soon.

 

Yeah factory four wire plug, good sensor about 15000 miles.

 

I found a local today that has a few, He has a Junkyard with alot of XJ's and parts. I bought some 16" factory Jeep wheels and some 245/75/16 Wrangler Mt's off him for 175.00 He also said I could get a sensor from him for 25.00!! I gotta hit him back up for some more parts for sure. Man my 99 XJ is looking alot better with some good skins and new 16" wheels I will get some before and after pics and also get a sound clip of my new custom exhaust. I had to add a 2" lift in the back to fit the tires form all the sag from the rear leafs