his not saying its an STi. he really should have a comma in there, its saying my06 wrx, STi spoiler, that important comma is missing.

guy has a perfect feedback rating?? and been a member for ages?
unless his account has been hacked by someone and they are posting this up

apart from the plates looking non australian which shows its proly a scam, it looks legit.

bids could get up the 25-30k mark which is what a my06 is worth, he takes cash on deliver, take that option and see if its real :P