I currently have no working o2's on my car, i have 2 "after cat" sensors but i dont have any cats so that renders them useless. Is there anyway that i can get o2's on my headers to somewhat improve my gas mileage. Or would having the first 2 but no rear ones be useless?

 

You need some O2 simulators for the rear 2 and get some good AC delco sensors for the front. Anything but Bosch should be good.

 

You don't have front O2 sensors hooked up? Are you saying that there are no O2 bungs in the headers? If not, you need to get some welded in and get some O2 sensors in there. I don't think the car will ever go into closed loop without fron O2's.

That will kill your gas milage.

Get the front ones in ASAP, and get the AC Delco's if you can.

The rear ones can just stay like they are.

Dan