The Spec-R was fitted with a turbocharged SR20DET engine, and differed from previous Silvia models by featuring a 6-speed manual gearbox as well as a 4-speed automatic transmission. The Spec-R also included extensive chassis and suspension strengthening via the use of larger anti-roll bars and strut bracing. The S15 featured the same 4-piston front brake calipers that were found in the Z32 300ZX but included a larger brake booster.