Originally Posted by Boosted Performance

The two post cat O2 sensors will go on to the driver side pipe feeding the turbo. Since these are post cat it is ok.

You can see two cicles if you look hard, dirver side down stream of the flex pipe, on the left side or inside..however you want to look at it. (second last pictures)

There will be a bung on the down pipe (about 10" downs tream from turbo) for a wideband sensor.