SPA Racing in malden has a FWD/RWD dyno, not sure what kind.
TRD Tuning in (manchester? i forgot, havent driven there myself, only been a passenger) NH is a newer shop, and they have a BRAND new AWD dyno. i go up there quite a bit with my subaru friends (since i'm getting my WRX on thursday

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*edit, that URL is wrong. i'll edit again with the right URL once i remember what the hell it is
*edit again --
www.tdctuning.com