isnt the moss act federal law?? that should still be active for you and you should be able to have the car fixed under that if nothing else since there are no mods.
I know it sounds over the top, but maybe talk to a lawyer about it? if there is no obvious reason they will not fix it under warranty and they dont have a valid reason why it was denied, then i would seek other means of having some sort of validation. maybe once a laywer makes the call to the dealer or send their letter stating the case, maybe it will change a tune somewhere.
have you talked to the service rep from SOA? if not, i would try that route as well. if you already have, did they ever give a good reason why they wouldnt cover it??
i guess i wouldnt let it go until i had a valid reason why they wont cover it under warranty, especially with no mods at all.
i dont think we have had any Wrx's in here with the smell so i dont know of any warranty claims accepted or denied here about it, but you can contact other dealers, as the one guy above posted about them fixing another car under warranty for the same thing..