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all ended well
I was able to clean out all of the old bolt with a tap and the threads are strong enough for an original (new) Porsche header bolt to not only hold but get torqued down and not leak.
What a pain in the butt! I spent 2 hours very slowly and carefully cleaning out the hole with the tap and got lucky that I did not mar the original threads.
No more exhaust work on this car for me!!
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