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It will fit on but I dont think you will not notice much difference as the sti is only slightly louder than the wrx one, I would go for a prodrive or aftermarket system the sti one will rust up quite quickly, as I dont think there made from SS.
Thanks guys already have a full stainless steel system from turbo back but I want a quiet backbox...as much as i love the engine noise its not healthy for the neighbours.