Just a quick update to this old post.
I pulled the elbows again, about 18 months later, they still look pretty good. A little bit of scale inside, hard to say whether it was built up exhaust or a little rust or both, but it scrubbed right out with a wire brush and some purple power. It was all on the mixer end of the dry elbow, the turbo end of the elbow and the turb itself were perfect. The mixer elbows also looked good.
I think I'm going to stick with them one more year and then replace. I found an aftermarket replacement on ebay that looks identical for $399.
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