Stainless isn't the optimal metal for extreme heat applications... and right between the header and compressor is about the most extreme a car can give. This is all hearsay, but it was just discussed on FA a few weeks ago. A few of the reasons I can remember is that stainless gets malleable, retains heat too much, and discolors. There were other reasons, but I wasn't paying that close attention. So we need a metallurgist to post in this topic now to clear things up.
-Jeff
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