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Quite frankly, if it was up to me I'd go with GIAC. There was only one reason that I chose AA, the CEL delete. To be quite honest, I'm not that happy with my AA tune either, and there are plenty of examples like me if you do a quick search. If you want a reliable tune and have no need for deleting your CEL, I see no reason to not go with GIAC. By the way, Bimmersport is a good shop, but prepare some extra time if you do end up going through them. On both instances I was there, it took a good 2 hours before I was out of there.
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Cheers
Ben
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