i want to change out my cracked stock exhaust header for an aftermarket one, but my question is how do I address the O2 sensor? The ones that Im looking at have no spot for the O2 sensor, also have seen pics of people putting these on there XJ's and they dont have the sensor on there. Is there a way to bypass that or will I have to modify the header. The motor that Ive got is a 4.0 I6 in a 88 XJ. Any info would be appreciated.

 

Drill a hole in the header and held in a boss.

 

Isn't the O2 Bung on the downpipe? I replaced my factory manifold with an aftermarket header on my 95' and I never had to touch my O2 sensor. Perhaps it's in a different location on an 88. If that is the case then do FrankZ's method and drill a hole and weld a nut there for the O2..