[Bug@5speed(US)]

When I still had my subaru, it has a bung for the EGT sensor on the up-pipe as you mentioned..

After I swapped to my new exhaust and retuned the ecu, we omitted the EGT sensor and just plugged the bung as it would not be used.

I can't remember why the ecu did not really need it. But I do remember that we ran a small resistor across the plug to simulate some resistance that would have been provided by the EGT sensor.

One reason that the EGT sensor is removed is due to it failing and breaking, thus the potential for it to go into the turbo inlet and causing some serious failures..

Ran like this on the street and track for over 50K miles until I had some oil issues..

Plenty of posts on the subject on Nasioc or other sister forums..
VR
ALex