I can't comment on their tuning, but I have had some work done on my A4 by them.
It seems pretty good, and I haven't had any problems with it.
Their workshop is always clean (some would say that is a warning, but to me it means they care about their work space), and the staff very helpful.
As I do most of the work I can on my cars myself, some of the prices were a little surprising, but when compared to other workshops I got quotes from they were on par.
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