Corvette ZR1 rated at 638 hp: VIDEO of the ZR1 hitting 205 mph
The 2009 Chevrolet Corvette ZR1's supercharged V-8 officially produces 638-horsepower, General Motors Corp. executives announced today. GM completed SAE certification of the ZR1's 6.2-liter LS9 engine and released the results at midnight.
thats why i asked, i dont see why there would be a semi on the test track either, and there was a sedan it passed before the semi... hmmmm either way its a killer video lol.lucky ba$tards that got to drive it. lol