I don't know if this is a repost but Nissan has responded to Porsche's accusations of false Nurburgring times.
http://www.motorauthority.com/nissan-maintains-gt-r-nurburgring-lap-time-was-legitimate.html
http://www.motorauthority.com/nissan-maintains-gt-r-nurburgring-lap-time-was-legitimate.html