Im about ready to finally have the exhaust finished up and installed onto my twin t04e turbo setup. Its a full twin exhaust setup, one pipe from each turbo, dual inlet/dual outlet muffler. Im wondering if anyone can give me some information as to what to do about a wideband. Im looking at (2) options. First is a single wideband either in one pipe, leaving the other pipe without a wideband, or would a h pipe type design where I have the dual exhaust have one crossover pipe and mount the sensor there (not sure if that would give an accurate reading for both) The second option is to have a dual wideband setup like those from FJO which cost in the neighborhood of $800. Just wondering what advice is out there

 

I can tell you that FJO recommends mounting the O2 about 1 ft. away from the backhousing of the turbo for best performance.

 

I know that, but that really isnt the question

 

Since all of the exhaust is coming from one source prior to the turbos, it isn't really an issue to have the WBO2S in only one of the down pipes.
Because of the high EGT's, I suggest you mount the sensor a little further downstream than you normally would on another application - 18" to 24" back from the turbo outlet.

 

I would just put it in the down pipe off the rear rotor since it tends to run a bit leaner than the front one.