In the Nissan range, the name Silvia has been used extensively since the mid-1960s for even very different cars. After six generations, the S15 version underwent numerous modifications to arrive at very sporty configurations, such as the 1999 Spec-R. With this car, Nissan sought to obtain a valid basis for homologation in the JGTC, Japanese GT championship. In addition to the introduction of an aerodynamic package, among the most notable changes were the anti-roll bars, suspension elements and the differential.