Wideband Placement on Borla UEL?
 

have any of you guys that have installed the Borla UEL header installed a wideband? If so, where did you have them install the bung?

Any photos would be greatly appreciated.

Ideally you want to place it in a location near the factory primary o2 sensor as that is where your car reads the Air/Fuel Ratio and you want to be in a similar location.

Be sure to allow for clearance for engine movement and don't place it right next the factory o2 sensor but actually on the opposite side and a few inches down if you can.

So which would be a better location?

Red or purple?
I honestly dont remember which o2 sensor was which when I installed my headers awhile back.

http://i.imgur.com/a5pDiOq.jpg

My fear of the red location is it's near a gasket and potential exhaust leak area which would result in a possible false lean condition.

Purple is OK but it's very close to the primary. I guess at that point purple is still the best option.

The farther from the engine exhaust point, the better for the wideband.

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Does our car use the secondary O2 sensor for anything other than catalyst efficency measurement?

No

Well there you go. Use the stock secondary bung, leave the original sensor out