Sandeep,
This is the 12-blade backside:
Note that the original 964 cone is missing here (still need to get that one
)
I really like the way the air is directed out in a straigth way. Also that that is done by a multitude of air diverters, which are also longer overall than the 4 on the old fan houses. Theoretically, it would make it easier to divert the air to 3 and 4, if half the work is already done inside the fan housing!
It would only be logical that porsche would upgrade its parts during the production of its aircooled boxers
Greets,
Walter