text: "D" indicates a dual overhead cam as opposed to a single overhead cam
  "E" indicates the individual engine ports are electronically fuel-injected 'single-cam'
  "S" indicates the engine is carbureted
  "T" indicates the engine has a factory installed turbocharger
  "TT" indicates the engine has factory installed twin turbochargers
  "P" indicates the engine runs on LPG (liquefied petroleum gas)
  RB20 (2.0L I6)
  The first RB20ET/DE/DET engines were fitted to the HR31 Skyline and the Nissan Fairlady 200ZR (Z31 chassis), produced from August 1985. The early twin cam engines featured the NICS (Nissan Induction Control System) injection system, while the later twin cam engines used ECCS (Electronic Concentrated Control System). Later versions which used ECCS engine management, discarded the twelve tiny runners for six much larger ones (though they retained twelve ports on the head, so there was a splitter plate). It was also fitted to the A31 Cefiro, C32 and C33 Laurel. The Fairlady 200ZR was fitted with an intercooled NICS type RB20DET.
  The first RB20E engine was used in the C32 Nissan Laurel, produced from October 1984.
  Laurels, R32 Skyline and Cefiros used the second (1989–1993) series RB20E/DE/DET. This had an improved head design, and used the ECCS injection system. These later motors are known as "Silver Top" engines.