I would think that the inner ring is a support to stop the exhaust from being collapsed by over enthusiastic spanner use on the clamp bolt.
But from those photos I cannot see how the chrome tip is held.
Is it in fact just a push fit?
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Ray at Wigan Pier
2014 A8L D4 4.0TFSI Gold (Sticker says "Beige") Can't leave you in a black smoke cloud anymore..
In progress, Nothing left to do.
Gone 2004 A8 D3 3.0 TDI. Ebony Pearl Black (with little bits of other colours and glitter)
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