Another day, another Porsche 911 GT3 RS 4.0 review – this time it’s a road test from Autoweek’s Roy Kleijwegt. This swansong for the 997 range certainly does the model justice; its naturally aspirated flat-six is a serious piece of kit – using forged pistons, titanium connecting rods, and the crankshaft from the 911 GT3 RSR race car – it develops an impressive 125 hp/litre, helping the GT3 RS 4.0 to hit 60 mph in just 3.8 seconds and 124 mph in under 12 seconds.