I wanted to leave the OE sensor in the O2 housing for now, and wanted the wideband up close to the turbo, so here is what I came up with. My O2 housing is a relatively expensive quality unit, so after toying with the idea of mounting it there, I decided not to mess with it and did this. It fits quite well between the oil return line, and the TDO5 short route IC pipe, and does not impinge on the hardware removal/installation of any component in any way. It is also a safe and proper location for the sensor itself on the correct angle so this should work out over time for various setups. I will be changing out my EvoIII 16g for an FP Green in the coming weeks and see no reason why there will be any issues, for example.
This is an APEXi N1 downpipe.
This is an APEXi N1 downpipe.