Audi Forum

audizine or audi-sport :) audi sport isn't as active but mostly UK based where as audizine is heavily american based, but has a lot more "how to" threads and such
 
I frequent Audiworld a lot, I only go in the A8 D3 section but there's new threads everyday, they are really friendly, very helpful, lots of tech/how to threads from retrofitting to mmi tweaks and performance upgrades.
 
Wbich car are you interested in because there may be a model specific forum such as the TT-Forum, etc.
 
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