With GM hotshoe Jan Magnussen in the cockpit of Zee Really fast One, the General's hypercar trimmed a staggering four seconds off its previous record-breaking lap time, bringing in a 7:22.4 lap around the 13-mile circuit. Although blisteringly quick, the ZR1's new time still falls short of the Viper ACR's best time of 7:22.1. We don't expect this glorious arms race to end anytime soon — not that we'd ever want these warriors of the raceway to quit duking it out. Guess it depends on whomever ends up owning the Viper brand.