Broken exhaust stud removal

And I now feel like a total idiot. Please tell me there is a way to remove a helicoil?? I didn’t snap off the tang. This one I gently threaded in but it will not come out.

Fortunately it’s not the blind hole but this is ridiculous.

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What is the issue?
I didn’t know I couldn’t back out a Helicoil once it was started.

But my bottom tap, US made, Helicoil branded, picked up in person from McMaster-Carr, has a different thread than the other taps of the same M8x1.25 STI designation!!

Two kit taps:

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M8x1.25 STI bottoming tap (right) vs m8x1.25 STI tap (left) used to cut the threads (which helicoils obviously thread into since I did it and got one stuck):

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