Joseph,
bro, want to upgrade car ar ? thats good man !
I'm not a Skyline sifu but here it goes ..
R32 started production from 1989 to 1993 but a few GTRs were made in 1994.
The R32 range:
GXi - The bare basic model R32 1.8 litre, rwd, non-turbo, no extras
GTE - 2 litre family model, four door, non turbo, single overhead cam
GTS - 2 ltr, in-line 6. DOHC, EFI, 2 & 4 drs, RWD, standard sports model
GTS25 - 2.5ltr, in-line 6. DOHC, EFI, 2 & 4 drs, RWD, non-turbo, sports model
GTSt - 2 ltr, in-line 6 cyl, DOHC, EFI, 2 & 4 drs, RWD, turbo charged sports car
GTS4 - 2 ltr, in-line 6 cyl, DOHC, EFI, 2 & 4 drs, 4WD, turbo - some feature GTR specs (eg ATTESSA 4WD)
GTR - 2.6ltr, in-line 6 cyl DOHC, EFI, 2 dr, twin turbo, 4WS, 4WD, ABS, HICAS...
if you want more info, log on to http://www.skylinesaustralia.com
cheers :)