Thanks to Miguel at Newera parts for the fast delivery and a very good support.
Yesterday I received the SARD breather tank and a "new" used drivers indicator light housing since mine was a little damaged! Me likey :)
I will quote "xxfr" from the GTR forum in order to describe what a breather tank does:
"The highest point in the RB26 water system is higher than the radiator 
cap location for the GTR's. Seeing that the radiator cap is normally the
 self-breathing location for the water systems, it fails on the GTR's. 
Nissan provided a bleeding point for this reason on the highest water 
circulation point just by the front engine lift location.
During hard driving the water system tends to create air bubbles which 
expand vigorously. This removes the water through the radiator cap into 
the reserve tank and continues to push the water out of the system. 
Without water the system cannot cool efficiently and engine temperature 
rises. 
This breather tank raises the self-breathing point to higher than the 
engine's high water circulation point. It eliminates the need for 
bleeding the engine as it self-bleeds. It also continually removes any 
air collected in the system while driving hard. 
The breather tank is very useful if you do track days."
 
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