Originally Posted by Z K
7:21 Nissan GT-R (2012) Toshio Suzuki October 2011 Nissan conducted test.
7:24 Porsche 911 GT2 RS Horst von Saurma Sport Auto (11/2010)
The 7:18 lap time for the GT2 RS is on Sport Cup tires which are race tires. GT-R runs on street tires.
The cup tires on the Porsche are street legal and OEM equipment. They are comparable in grip to the tires the GT-R uses. Furthermore, if you want to do an apples-to-apples comparison, throw out the manufacturer times and use Sport Auto's exclusively. They got a 7:34 for the 2012 GT-R. Their times for the GT2 are 7:24 for the RS (as you noted) and 7:32 for the "vanilla" 997 GT2 that pre-dated it.
2008 E90 M3, Jerez Black, Black Nappa, Brushed Aluminium, 6-speed, Premium, Tech, Cold Weather