has been publicly released. Also, the twin pipes were used as far back as the 60's. Heck, when I told my dad what we did on my car, he said that they fabbed the same thing 30 years ago for the jet engine field. (i.e. no way in heck it could get patented unless we danced around a loop hole. Dancing around a loop hole also meant ANYone else could do the same dance - i.e. RVM, Z1, etc.)