that is weird. according to the www.ravenblade-impreza.com
code chart... every 1993-2001 impreza sedan or coupe is labelled GC8. even the 22b is labelled GC8E2SD.
the 2 door 2000 Subaru Impreza STi type R is labelled GC8G2FD
and the four door RA limited is GC8G4FD
what determines the number of doors is "G2" and "G4"