Can't go wrong with North Shore Motor Werks in Peabody, right off Rte 1.
http://northshoremotorwerks.com/
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2015 335xi Black/BLK, FBO BM3 Stage 2, AA FMIC, CTS Turbo CP, FabSpeed Sport Cat DP, MPPK airbox w/high-flow filter, 18" AG M310's black