Yeah, under the glovebox, remove the plastic cover underneath it, theres a brass wingnut or two, can't remember, take it off and behind that is the "boot" or seat for the filters, pry it out and whala.....
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Not very many GS3's will have them , so if you don't you can try and make one. If you do some searching you'll find out how to clean it and keep it clean and you'll never have another problem with it. <_<