Stock is 12 mm, Bosch LSU 4.9's are 18 mm. Huge difference.
Front, easy enough.
Rear cylinder. There isn't any room to mount it without either leaving off the heat shield or cutting it up. Suggestions? I can handle welding easy enough, placement is what I'm looking for now.
So the only realistic spot to install the wideband (and not interfere with the heat shield) on the rear header is on the down section of the pipe, downstream of the stock sensor.