Recently, Porsche Classic announced an available navigation system for pre-1998 models using a DIN-1 sized original radio, which includes the 911, the 912, the 914, the 924, the 928 and the 944. As a selling point, the system includes a choice of control knobs to more closely match the original design of the car's interior, but the DIN-1 size limits the display screen to a mere 3.5 inches, measured diagonally.

That makes it potentially hard to see, particularly when positioned to the right of the HVAC controls. On the plus side, the system does provide Bluetooth connectivity, meaning that owners of vintage Porsche models can now enjoy hands free phone conversations and, presumably, audio streaming, all with a genuine Porsche product that requires no cutting of the dash to fit.

So what belongs in a vintage car?