No they do not. In fact TubiStyle just told me this morning they were aware of these situations accuring every nown and then and have asked the factory just like they did in the past to be aware of it. A Tubi exhaust bought from that company or any other overseas dealer will have to go back to that dealer for a warranty claim. In addition the factory has stated as recently as this morning that Tubistyle is the only importer to the US and exhaust systems as well as TSI accessories can only be sold thru their authorized distributors, one of which we now are (exclusive for the NSX).