I would imagine the individual flanges and the slip fit to collector setup help to allow the titanium to flex/expand/contract as well. I know some people have questioned the choice of titanium for a header and rightfully so as it can crack. But it's all well supported, well made and won't be holding a turbo or being driven too hard or frequent so it should hold up just fine. I definitely trust the judgment of the guy doing the work too.
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