Originally Posted by Mike 01Hawk
First there is no EGT in the UP, it's an O2 sensor for the 02-03 wrx folks. And putting an aftermarket EGT in the UP isn't the best place to put it.
Second, I had no problems at all with my ebay UP on my '05 STi. <shrug>
I don't know what 02-03 wrxs you've worked on, mine and all my buddies' had an egt bung in the UP. Front o2 bung is in the manifold.