GM is making some good stuff lately.

[Maengelito]

its the last page in the article:

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The cars featured here are all unmodified production vehicles, but we did request models equipped with performance-enhancing options such as larger brakes, stiffer suspensions, and the best wheel-and-tire packages. After filling each car with premium fuel, setting tire pressures to the manufacturersÔÇÖ recommended numbers, and checking the oil, we mounted a Racelogic PerformaceBox GPS-based data logger on the windshield to record lap times and other figures. The three drivers were Tony Quiroga, Tony Swan, and Larry Webster. Each was assigned several cars. Weather has a pronounced effect on vehicle performanceÔÇöa car runs faster when itÔÇÖs 70 degrees than when itÔÇÖs 90ÔÇöso the drivers cycled through their cars twice, running three to five laps per session. The lap times are the best each car produced in either session.