R33 GTS25 Spec 1 vs Spec 2

[Camzshaft]

What is the difference? I cannot seem to find info on this anywhere!? Also, if anyone has the info, please explain these too. Thank you people

GTS25 type M
type X
type G
type S

[Skym]

Series 2 = Electronics for engine (ignition system / coilpacks, ignition module and wiring, ECU has different Consult / programming).

Type-M = The M stands for Modified, usually with parts from GTR like steering wheel, brakes, shocks, HICAS.

The other models requires the catalogue from Nissan. Might find a copy on the internet or where to buy a copy (Japanese only).

Usually they are versions with different steering wheels, brakes, interior, rims, engine, etc.