Not long ago, the Koenigsegg Agera R set a world braking record going from 300 km/h (186.4 mph) to zero in just 6.66 seconds. That test was conducted by German magazine Sport Auto and it helped to solidify the reputation of the Swedish supercar as a supercar to be reckoned with. And now the same publication has just performed the same test, but on a Porsche 911 GT3 RS 4.0. That car has astoundingly set a new braking world record of only 6.5 seconds.