GT3 RS 4.0 is the final and the greatest edition of the Porsche 911 997 series. It is a sort of greatest hits version featuring the best of what the other 997s offered. Well, engineering-wise at least. The 4.0 has 500 hp while the weight has been reduced to 1.37 kg. As far as driver’s cars go then, this is one of the greatest of all time. Too bad then it’s limited to only 600 units. And anyway, thanks to the new 991 we are not going to miss the 997, not even a bit!