Upon comparison, the Porsche had a top speed down the final long straight of 313 km/h and compared to the Vipers 282 km/h. Also, the Porsche carried much more speed through the final set of turns after the straight leading to the finish.
I don't think its tires like some said, if the viper were pushing 700hp and the driver carried some more speed through the end, I think the gap would significantly decrease. Unfortunately, that just wasn't the case.
Regardless, Bravo Porsche!
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