Harmonic pulsation / Vibration?????????

then you have not looked!

[ame="http://www.google.com/search?q=magnaflow+exhaust+drone+&ie=utf-8&oe=utf-8&aq=t&rls=org.mozilla:en-US:official&client=firefox-a"]magnaflow exhaust drone - Google Search[/ame]

you are segregating the words vibration and harmonic....same same in this app.