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sorry for the crapy cell pic but does a o2 senser go were the red arow is? wen i got the truck there was nothing in it so pluged it up with a bolt so it wasnt so loud.
Nope 02s are usually down farther on the pipe closer to the cat. That might have been for the air injection system or egr? I'm not positive just taking a guess. What year and motor?
thats the same exact manifold i have on my truck but i didnt know what goes in there so i thot it was a o2 sensor but i dont know, all i know is it has threds on it.