I like the rear end fascia ALOT!
Those extra vents above the exhaust pipes will vent air from the hot undercladding "sealed" area, into the relative vacuum at the rear end of the car, and increase overall airflow THROUGH the GTR's airflow system, which takes air IN from the FRONT, and vents it OUT the REAR into that rearend vacuum.
This makes more sense to me than the Carbon Fiber Diffuser now advertised elsewhere, that almost completely removes the ventilation section from the rear end of the car. The square inch area of that little center vent dealie looks way smaller than stock big mesh vent area; though from a Prettiness standpoint, the Diffuser is Great
The proximate problem on the cars is NOT rear end downforce at this time...it is COOLING, and this rear end fascia helps. The carbon fiber diffuser...not so much, imho.