Had a similar problem onmine after a non genuine wing was fitted. When I had the bare metal re-spray 5 years ago it got replaced for the genuine article...that fitted and sounded better when you tapped it too.
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Coupe quattro 1986:-~450bhp + loooong list of mods!
Audi A7 Bi-TDI SLine Black edition 2015 mapped to produce 600lb/ft torque!
Audi S4 4.2 V8 cabriolet 2004:-
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