Motorsport Magazine France compares the acceleration of the 991 PDK Carrera S to the 997 GT3 RS 4.0
Here is an awesome Porsche naturally aspirated 6 cylinder battle. The new 991 Carrera S sporting less displacement and horsepower but with a PDK dual clutch transmission versus the lighter and more powerful 997 GT3 RS 4.0. Unfortunately, they only video the speedometers accelerating and do not show an actual head to head race between the two which is a major letdown. Still, a nice comparison and the 991 holds up surprisingly well until the horsepower of the GT3 RS 4.0 takes over.