Porsche unveils 911 Carrera 4 GTS

Undoubtedly one of the highlights of this year's Frankfurt show will be the unveiling of the much-anticipated new Porsche 911. But before we get to September, the German manufacturer is clearly intent on extracting every last euro from the current variant.

The prolific sports car maker has just announced that before the autumn it will squeeze in four-wheel drive versions of the GTS-badged 911 it launched at the beginning of 2011.