So I was getting ready to reinstall my exhaust system - that's all I have left to do before finally trying to fire it up!
While cleaning up the collector end for the silencer, I discovered a hole just ahead of where the silencer clamp fits - here it is, lit up with a flashlight:
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I'm not sure if this is repairable, the rest of the collector seems to be in pretty good shape, not too rusty inside.
I happen to have bought a spare header set awhile back; I wasn't looking since I thought mine was ok, but someone offered it at a good price, so I grabbed it. It's got less surface rust on the pipes than mine, but it's got some impact damage, especially pipe #1 and the bottom of the collector. The end of the collector is in much better shape, a lot less rust at the joint.
Actually, I was thinking I could take my good pipe #1 and switch it out with the damaged one, but I'm hesitant to start dismantling things since, while it appears the pipe gaskets are still available, the clamping hardware doesn't seem to be, and I'd hate to find myself with no working headers at all!
Here's my original headers - less road damage, but surface rust near the tops. And that rust hole at the bottom, of course!