I've had a lot of work done on my 2011 E92 by Futrell Autowerks in Beaverton. Dean Futrell's a great guy and his guys do great work.
He's a Dinan dealer and I bought my exhaust from him and had him install it, reflash the ECU, install an UD pulley, etc.
http://www.futrellautowerks.com/
He is more focused on the Audi space, so I'm not sure I'd go to him for a full engine tear down or anything, but for relatively simple mechanical stuff like most typical modifications, he does great work.
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Jason - Sammamish, WA
2011.5 E92 - Alpine White DCT ZCP
Dinan: Exhaust, Intake, ECU, UD Pulley, Pedals; AFE: Air Scoops;
2008 Ducati 1098s