Porsche is being put under enormous stress in order to produce lower CO2 emissions from their cars. The London congestion charge will affect sales of all Porsches in London.
A 3.2 litre V6 diesel twin-turbocharger producing over 300bhp will be used and Audi will be developing it but during this time, Porsche will be producing their second Cayenne due for the 2010 model year. Other more powerful engines (V8, V10, and V12) were also considered, but eventually called off due to their heaviness.