Don't think there's any relevance or relationship between modern road cars and modern race cars? The Porsche 911 GT3 Cup race car shares 80 percent of its parts with the road-going version, and many of the differences are about safety and even more extreme light weight, rather than raw performance.
This video shows the behind-the-scenes look at the car, and the drivers that extract the maximum from them, in the Carrera Cup GB one-make series in the U.K., which uses exclusively Porsche 911 GT3 Cup cars. Though the video is a bit short on great track time, there's enough info and 'tainment to justify the three minutes of your day.
[Porsche]
