I bought these and assumed they had an O2 sensor bung, I guess I was wrong. What are my options (preferably easiest) for installing one? Just cut out my old one and weld it in the same spot? How do I remove the sensor itself?

 

Buy a stainless steel O2 bung (Jegs for example or your local muffler shop). Drill a hole, and TIG weld it. That or take it to a shop and pay them to do it. Shouldn't be more than $30. You just need to know exactly where you want it.

 

I can weld it, thanks! Does it have to be an exact spot or can it be roughly the same location as the original.

 

Not in the original location...of the manifolds. The manifolds were way up and facing the front. The O2 bung on shorty headers should face rearward towards the driver. I'd say directly straight back. The reason is that forward facing runs into the k-member. You want it in the middle of the collector area.