New Viper ACR probably just crushed every car, 918/P1/LF included most likely...
Here are all the tracks they've set records at. It bested the 918 by more than 1s and 2s at Laguna Seca and Willow Springs, respectively.
http://m.youtube.com/playlist?list=PLf6xEkPrQwBUuY3PI7R-d-ZQFVNs0HLuP