Typically that means work has been done to the blower and that may be a serial number of sorts and the date it was done. I've not seen anyone talking about that on a stock blower. Have you taken the snout off or inspected inside it to see if it has been ported?
As for the brick it can start to collapse even under stock boost. It is rare but I've heard it can happen. Time to get it send out to get it reinforced.
As for the brick it can start to collapse even under stock boost. It is rare but I've heard it can happen. Time to get it send out to get it reinforced.