It would end up about right on the weld where pipe tees off to work . I personally just welded mine in right below the bung that was in pipes when I bought them but then its not at the correct angle that was recommended in the instructions but I havent had any issues with it

Where I have pipe marked with black marker is where I think you need to weld the bung in and not hit anything with O2 sensor.
Anyone else who has welded one in is more than welcome to confirm if this is right or not
