The 911 GT3 RS 4.0 takes the 997 out with a bang. It was so late in the coming that Porsche had to restart production on the model. The result was something special. All 600 RS 4.0 models sold like hot cakes thanks to the car’s amazing performance. The fact is, most GT3 owners take their rides to the track regularly, and the RS 4.0 is the king of GT3s. The 4.0 in the moniker stands for the displacement, which is 0.2 liters larger than the GT3. That displacement comes from a longer stroke and, coupled with enhanced air-flow, titanium connecting rods, and a single-mass flywheel, the RS 4.0 brings 50 more horsepower to the track. The roar of the flat-six is more than enough to encourage hitting the 8,500 rpm redline, but this race-bred brute just loves to scream throughout the powerband. Sure you can drive the GT3 RS 4.0 on the road, but just make sure that road leads to the nearest race circuit just in case.