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