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Also from Framingham and Imperial in Wilmington is down the street from where I work. Great shop, Derek is a cool dude and he did an awesome job on my car after I was rear-ended.
I'm out that way also. But I've heard good things about Brentuning
Called Brentuning last week and they said they don't do Nissan/Infiniti anymore -- something about licensing issues and support being a pain/not doing may per year so not worth it for them. They suggested Kaizen in Boxborough.