One more comment as a word of caution. One you can hear the leak, hot exhasut gases are blowing by. The combination of temperature and corrosive gases, and velocity can cause erosion. If you wait too long, it could casue the sealing surface to erode and the it would have to be machined to get a good seal. This is only a problem after continuing to operate (for weeks) once you hear the leak.
Best Regards,
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