Yea VERY sure its bb, i didnt realise at first and i was told the BB hav dual intake fins, 6 bolts on the exhaust side, and oil & water cooled, all which this turbo has.

It also doesnt have a hole in the exhaust housing from where the actuator arm goes thro, its the kind where the actuator arm goes thro the dump pipe if you know what i mean. i cant find a pic...