No stateside SR20 had Nissan's Variable Valve Timing (VTI). I has just recently been given to us in the QR25DE found in the SE-R Spec-V. For some reason they keep all the good ish in Japan. The motor NC was refering to is called SR20VE. All SR20DET's S15 Silvia and up had the VTI. I'm not sure if the S14 Silvia had it. I'm almost positive that the S13 didn't.