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So, I was installing the Adaptor to get the 12mm O2 sensor to fit the bigger hole on the front header. (I know, not recommended) As I am looking around, I actually find the 12mm hole on the other side of the header, so it had both. Awesome! so I go ahead and plug the bigger hole and hook up the O2 sensor into the smaller hole.
Looked at the rear header, and there isnt the smaller hole? Doesnt that seem weird that the front header would have both sizes, and the rear only has the bigger O2 sensor hole? I flashed a tune on it, so not sure if that will mess anything up?
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