if you have no vin number on your firewall your car HAS been converted. Subaru started using stamped vin numbers in 1973 on firewall and in 1981 it was nz legislation to have them. My old man is a wof inspector and i am doing my papers and he said if its not there then he would fail car, alot of places would probally not notice or care so no biggie but i would say it has been rebodied (not well done either).
On a side note any info you get from subaru themselves is probally useless as i have delt with them locally where a tech with 18yrs experience couldnt fix a code 66 in a bg gt, it was forums like this where i got awnsers and solutions, please show some respect to the members here who probally DO know everything (or close to) about these cars, alternatively piss off and go join a blowarse homo forum where you will learn nothing.