We’re all familiar with the MP4-12C, McLaren’s newest supercar. The guys at Autocar get the chance to drive the track version of that car, the MP4-12C GT3. They both share the same monochassis and engine, but that’s it. Everything on the GT3 is obviously aimed at being as powerful and as light as possible. Different suspension, breaks, no interior etc. are just some of the major differences between the two. Nevertheless both are some of the best vehicles within their category.
SpeedVids
SpeedVids 
Now that’s a beast of a car :).
The sound is insane. I wish the road version mp4 would sound like that!