My dad wants to put his stock pipes back on his 2012 Street Glide. Which 02 sensor goes in the correct spot on the stock pipes. Right now he has true duals. I just want to make sure the correct 02 sensor goes in the correct spot on the stock exhaust.

 

Under the side cover, the grey is the rear one and the black is in front.
They are color coded to match the connections. Grey to Grey and Black to Black.

BUT, the grey plug wire goes to the O2 sensor in the pipe coming from the front cylinder.
The black plug goes to the O2 sensor in the pipe coming from the rear cylinder.

 

Thanks. That makes it easy.

 

I am thinking that when I had mine off my 13, that the holes in the stock pipe were stamped with a "B" and either a "W" or a "G".

 

Chief didn't make a big difference with the stock head pipe with cat over the one you have that is decatted?

 

I can't honestly answer that because i decatted it and did the PowerCommander before I ever rode it.