text: This engine was manufactured with a reinforced cylinder block and cylinder head, metal head gasket, pistons with cooling channels, forged crank shaft, forged connecting rods, N1 turbine with reinforced actuator, high flow intake, stainless down pipe, and low exhaust resistant sport cats, most of which were not offered for the RB26DETT.  RB-X GT2 engines competed in LeMans 24hr race, Pikes Peak, and other forms of motorsports. GT500 and Z-tune engines are also based on REINIK's design although later built by NISMO's Omori Factory.
  REINIK also made over 20 RB28DET based on the R33 RB25DET. These engines were ordered by Prince Nissan Dealership network for a special edition R33 GT25t called 280 Type-MR.  The engine was built for high torque and limited to  and  of torque.
  Stroker kits
  There are many stroker kits available for RB Engines (some only available as proper kits while others being achievable by using cranks from other engines, for example a GT-R crank, pistons and rods in an RB25DET will make its displacement 2.6L as the Bore is the same as an RB26DETT).
  Achievable Stroker Displacements for RB Engines:
  RB20 - 2.2, 2.4
  RB25 - 2.6, 2.7, 2.8
  RB26 - 2.7, 2.8, 2.9, 3.0, 3.15
  RB30 - 3.2 (Nitto), 3.3 (RIPS), 3.4 (Spool Imports)
  RB26 - 3.2, 3.3, and 3.4. (Project RB)