There is only one color available for this vehicle, it is unnamed in-game:
This description is taken from the PAL version of Gran Turismo 2:
The 2nd generation CR-X, EF-8 type (launched in September 1989) shared its basic components with the Civic, having the same double wishbone suspension as the Civic, but the point that distinguished it from the Civic was the short wheelbase. Furthermore, the body combined with that chassis portrayed a strong sports image in its 3-door hatchback configuration, and presented a model which promised a really thrilling ride. At the time of its debut, the top model featured the 1.6-litre in-line 4-cylinder DOHC ZC type engine, but when a minor change arrived in September 1989, the VTEC type B16A engine which had become a talking point in the Integra was fitted. Thus, by combining this with a body just exceeding 1,000 kg in weight, the car achieved very sharp characteristics. The car tuned by Mugen based on this 2nd generation CR-X was called the Mugen CR-X PRO.2. The characteristics of this model are primarily the aerodynamic parts. Those aero parts were originally styled from race marshalls' cars, but further refined for street use. While retaining the individuality of the normal CR-X, the car was given a sportier feel, from the wide front bumper spoiler to the side steps and the rear under-spoiler, even looking at it now we can see that it has quite a high level of finish. Moreover, apart from the aerodynamic refinements, alloy wheels, suspension kit and power enhancement kits were available, and if they were all fitted it was possible to build a truly satisfying, cutting-edge CR-X.