Just read you're answer and thats what i was looking for. I didnt think t306 would expand that much. I also have never seen my EGT's go over 1100.. granted that is being monitored by the subaru ecu and not a third party unit.
I will be replacing it with one that doesnt suck. Welding it correctly is no issue. Will probably go with one with a large enough ID to slip over the pipe instead of ******* around with a butt joint.