You don't even say which M3 you have. The E36 with S52 engine is pretty much the same engine as any 325 or 328 of the same era and any competent shop can handle that. The E30 and E46 engines are a little more unique. James at RRT near Dulles has tons of experience working on both. Bill Shook at Kraftwagon in Alexandria has worked on the E30's S14 for many years, including more re-builds than he desired. I don't know if he's taking on new customers now or not.
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