Nissan may have been using one of their "ringer" cars at the Ring. 
If you read the latest Car and Driver they did an article about the inconsistency in Nissan GTR test cars. Evidently some of them have significantly more horsepower than Nissan claims, to get the acceleration times they're getting. That's still up for debate, but on average it just looks like a plus for anyone who buys one. Porsche may be comparing the power/weight ratio claimed by Nissan, which C&D has shown to be under valued.
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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