Rear Exhaust Manifold

[Forward1]

NOT an expert here at all....anyone with a diagram for a 97 grand prix GT that shows where the rear exhaust manifold is and where plug 6 is located. I am trying to find the O2 sensor and I am not sure what I am looking at. Thank you for the help.

[Ripn12s]

o2 sensor on the rear manifold is located right before the downpipe where the 3 pipes come together.

[shingle_man]

http://hulkspeed.com/installation%20procedures.htm