Building test pipes, best place to put bungs to reduce CEL code???

[rj45]

I have comptech headers, I would hate to drill into them but I guess that would probably work and then put the other one just as far away as the stock wire goes... Or I could extend the wire and put one in the exhaust.

How have others done it? I looked online for 30 minutes today and no concrete answers, sorry if it is out there under my nose...

 

[Larry Bastanza]

Are these new headers from CT? Should be no need to drill anything, and they even come with a 02 sensor wire extension for the front primary.