Copy&Paste from Motortrend.
If the 2012 Corvette was completely stock (other than safety equipment), with the same driver, then how did Chevrolet shave an impressive seven seconds off of the ZR1’s last lap time in 2008? Well again, according to Juechter, “We feel we have a pretty substantial performance upgrade.” Possibly the biggest improvement on the 2012 ‘Vette ZR1 is the addition of those Michelin Pilot Sport Cup tires. The DOT legal tires are quite possibly some of the stickiest rubber you can get for a production car and they’re new to the ZR1 this year. In addition to the new tires, Juechter says that the Corvette team has made other improvements to the ZR1, “We also have other chassis improvements [and] aero improvements, so we hope to show that we really improved the capability of the car.” With a seven-second lap improvement, consider us shown.