Hello, John and Doves,What's the difference between "Tromba," "Strunza," and "The Silent Killer?"Tromba: Brrrrrrrrack!!Strunza: HusssssssseinThe Silent Killer: under the radar, stealth deployment of methane--a wolf that smells like a flock of sheep (http://www.fresnostate.edu/jcast/asae/about-us/facilities/sheep-unit.html)~Blessings,Mike