In FIA GT2 championship, in order to render the car performances more uniform, the cars are forced to run with a specific minimal weight and with an engine restrictor that depends on the engine displacement. Hence the 4.3 L V8 engine in GT2 races is destroked to 4.0 L in order to compete in the 3.8–4.0 L class, which is allowed to race with a minimum weight of 1,100 kg (2,425 lb). Using the 4.3 L engine, the minimum weight of the F430 would increase by 50 kg (110 lb). In this race configuration, the engine produces somewhat less power, but this is compensated by the lower car weight, which yields a better weight/power ratio.
Advertisement
http://en.wikipedia.org/wiki/Risi_Competizione