Cars from 1 March 2001 are taxed according to how much CO2 they emit ... 2dr Cabriolet 299 g/km £0 5.0 V8 450 55 Edition 2dr Cabriolet 305 g/km £0 5.0 V8 450 55 Edition 2dr Coupe 297 g/km £0 5.0 V8 ...