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.
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.
Jason - Sammamish, WA
2011.5 E92 - Alpine White DCT ZCP
Dinan: Exhaust, Intake, ECU, UD Pulley, Pedals; AFE: Air Scoops;
2008 Ducati 1098s