Hiya guys. Im having trouble decoding a applied model code.

Goes as follows: GC8FK8D

Its a MY98 sedan so the problem is it should be: GC8E48D

Any ideas as to why its got an "FK"

Based on the APPLIED MODEL number on you VIN plate you should be able to find out, your exact model type.

The 7 digit "applied model" code found on the vehicle identification plate inside the engine bay is decoded in the following way.
1.Series code G=Impreza S=Forester B=Legacy etc.
2.Body type F=Wagon C=Sedan
3.Engine type 8=2.0L Turbo
4.Year code A=MY93 B=MY94 C=MY95&96 D=MY97 (facelift) E=MY98 F=MY99 G=MY00
5.Number of doors 2=2 door coupe 4=4 door saloon 5=5 door wagon/hatch
6.Model type 8=WRX 7=RA type E=Sti D=Sti Type R & RA
7.Transmission D=5 Speed Manual AWD P=4 Speed Automatic AWD

All information comes from the Subaru Impreza WRX Sports Parts Catalogue

Yeah. However noone neems to know what the FK means.

well straight out of the impreza parts book
G = Impreza
C = 4 Door Sedan
8 = 2000cc 4WD
F = 1998
K = General Destination (RHD)
8 = WRX (AUST)
D = DOHC EMPI TURBO w/Centre Diff MT

Thats it thanks.