You can try Euro Motorworks- they do quite a bit of Audi work.

If it's simple tech work, and it comes with instructions, I'd suspect most of the aftermarket shops could do it. In that case, I'd try Trackside Supply and their adjoining shop, off of Gasoline Alley.

<ul><li><a href="http://www.ecstuning.com">http://www.ecstuning.com</a</li></ul>