I’m not sure disabling the sound is even breaking the law at the moment. The feds legislated a requirement that car manufacturers include the PWS, but it’s up to states to legislate motor vehicle code that would require it or criminalize disabling it. I searched PA’s code and couldn’t find anything, though PA is probably late to the party on anything not related to alcohol. As other have suggested, it is possible that you could face increased civil liability if you hit a person while it is disabled, but it’s probably not something that is “illegal” yet, at least in PA. We will not likely see any legislation on this until PA is ready to make the testing of PWS a part of annual vehicle safety inspections.