Originally Posted by 1055
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.
304, you mean. And yes, it expands quite a bit. I don't believe the stock EGT can read higher than 1100F, but someone like Fahr would know for sure.
If your peak EGT's really are 1100F, then your tune is leaving a LOT on the table.
If I were you, I'd probably go back to stock headers. Most street cars won't benefit from aftermarket headers until you reach pretty aggressive levels of power.