Although the 7-litre Zonda S had only been introduced two years earlier, Pagani launched an updated version of their critically acclaimed C12 supercar at the Geneva Salon in March 2002. Featuring an AMG engine enlarged to 7.3-litres, this monstrous V12 now came equipped with a revised air intake system. Displacement was 7291cc thanks to a bore and stroke of 91.5 x 92.4mm respectively, the resultant five extra horses taking output to 555bhp at 5900rpm. With the S7.3's weight going unchanged at 1250kg, it meant the Zonda was now capable of 0-60 in just 3.6 seconds and nearly 215mph flat out.

In addition to new engines, S7.3's were also fitted with 18-inch OZ Racing wheels, reconfigured ABS and Brembo brakes measuring 355mm up front and 335mm at the rear. Even more exciting though was the arrival of a spectacular Roadster exactly one year later. Having been in the pipeline since 1999 (reputedly gaining type approval at the same time as the Berlinetta), it wasn't until March 2003 at the Geneva Salon that the first customer Roadster was displayed. This was the yellow-over-tan ostrich hide example seen below and was ordered by a German collector who already owned two Berlinetta's. The central tub was strengthened and the rear subframe modified to cope with the different loadings.