exhaust drone/harmonic resonance

This guy installed resonator tubes on his Shelby Mustang with electric cutouts on the resonator tubes. Interesting to hear with and without them. He says with them he can now listen to the stereo and talk in a normal tone in the car while curising.

[ame="http://www.youtube.com/watch?v=ijwxKDVnAec"]Cruise Loud or Quiet - Exhaust Cutouts Installed on Resonator Tubes - YouTube[/ame]