Q5. Tell me about the engine kit for ZZT231 in Japan.

A5. 3TZZ kit by Trial The cost is 280000yen not including ECU.

 3TZZ kit by Brashboy
  2liter kit 320k yen, clutch for 2liter engine 138kyen, header 168kyen
  ECU (powered FC for ZZT231) 118kyen, intake 27kyen

Anyway, very expensive mod.