Where to add O2 bung on headers?
 

I just received Motordyne headers. Before I send them out to get ceramic coated by Swain Tech, I need to add 1 or 2 bungs for a wide band.

Where is the best place for doing this? I have no idea how these things will hang, or what interference I might have if its in the wrong spot.

I put some numbers so you could give me your opinion. Should I just add 1 or 2?

Thanks!

You want to weld on the bung on the downstream side of the collector so it would be near 6, 7, 8. From your picture, I'm guessing that's the driver side header. You will need to weld them between the 2 and 3 o'clock position because space is tight below the car (so opposite side from 9, 10, and 11). If you weld them any higher than that, there is a good chance you won't be able to get your O2 sensor in the bung.

I attached a picture of where I had mine welded on. I actually welded mine on the exhaust pipe because there was minimal room on my headers. Ignore my ghetto heatsink...

I would recommend putting one bung on each side so that you can monitor each engine bank.

Thank you fork! My gauge will only monitor 1 bank though. Is it common to have 2 wide bands? This will be supercharged on Ecutek.

I am using an Innovate Motorsports DLG-1 which monitors and displays two AFR readings from two separate O2 sensors at the same time. I am certainly not in expert in wideband gauges but my guess is if your AFR gauge only displays one reading, you would only need one sensor (and one bung). I wouldn't put anymore holes in those nice headers than you need to.