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Discussion Starter · #1 ·
It's the bolt that retains the db insert (item #7 on diagram).

Akrapovic part #: P-FB28



Had to drill mine out as the head rounded off, so need to ID the thread so I can run a tap down it to clean it out. Failing that i'll just have to M5 helicoil it or something.
 

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Discussion Starter · #2 ·
Nevermind, pretty sure its a standard M6 thread :)

Sent from outer space
 
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