I was just recently introduced to Farley, the proprietor of EuroTech Motorsports in Natick, by some of the F80 M3 subforum members. He does mostly BMW, but also has some Porsches around his small shop. His is a Dinan authorized (or whatever) shop - there's a big banner on the wall, and it's on his website too. He came very highly recommended, so I just (in the past 4 days) had him install TPMS, mount tires, balance & install my winter wheels/tires on my M3. Result: I'm 100% satisfied and quite happy with the overall experience. My impressions of him: thoughtful, meticulous, professional. He's my new go-to guy for BMW. Close enough to Boston that it might be worth a trip out to Natick to meet him in person.
Relevant mods thread here:
http://f80.bimmerpost.com/forums/sho...php?p=19641388
Not sure what "Shockware" is, but I think his personal F80 M3 has one or more Dinan mods on it, although you'd do well to ask him about it directly.