I haven't heard of the shorties throwing codes but the long tubes have been. I think they been putting some kinda fouler (whatever there called) to trick the computer. I should be getting my JBA shorties in next week hopefully and installed by next weekend. I think you need to use the search button because there's a but of info out there about the JBA shorties in particular and stop listening to whoever is telling you that your stock manifold is better than an aftermarket. Besides a dealer can't instantly void your warranty, ever heard of the moss magnuson act?