C15 exhaust sleeve failures

Thank you all for your feedback. I bring up the question because we currently supply a 304 Stainless, TIG Welded sleeve with full penetration ID and OD weld. These sleeves have been performing well, but I am also looking at a "weldless" design and was wondering if all CAT failures was at the weld, or if there is more of a micro-structural breakdown of the Alloy in general due to the environment. We have not had the opportunity to look at actual CAT failures for micro-structural analysis.
Attached is a cross section of our weld.

 

Also thought I'd chime in on the re-use of sleeves by just changing the gaskets. Don't do it!
If you get a full life out of the sleeve without a failure, then spend the money to replace the sleeves, or you will probably take out your turbo, or turbos the next time around. 304SS in this environment will only hold up for so long. The thermal cycling up to, what 1300F? is the main red flag. The expansion and contraction of the Alloy over time is a killer.