Buttonwillow Configuration 13CW. The US time attack measure of performance. The previous quickest time was held by the HKS CT230R.
Sierra Sierra EVO 8 Time Attack car beat the long standing HKS CT230R's record of 1:43.523 set back in November 2007. The record breaking occured this past weekend at Redline Time Attack's first event of 2010 (and first event under new ownership) at Buttonwillow Raceway using the 13 clockwise track configuration.
Head over to MotoIQ for Eric Hsu’s write up on the Sierra Sierra Evo, and some of his responses to the haters out there.
Source : MotoIQ