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I've always used Owen at Kensington auto works in the seacoast area - still do though I now live in Lincoln.
He has a Dinan m5 and a swapped 5.0 z3 and for me alone has worked on multiple e30s, e36s, e46, e90/91 and once out of warranty will work on my f23.
South of the border in Tewksbury is Ace Performance - an actual BMW engineer keeps his tools there and Baer (owner) is an enthusiast and his tech is as well (s54 swapped e30).
If you want to stay in the corridor I've heard good things about 3D in Londonderry but no first hand experience.
Good luck!
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