do us a favor and get one, theyve got a money-back guarantee. maybe if someone gets one and lets us know, we'll really know. maybe they do do something. im sure it does help w/ fuel efficiency. cuz i think one version of the ga16 has a different head design that allow for better "swirling" in the combustion chamber, which is what the tornado does. the different design of the head is to increase fuel efficiency.