It sounds like someone recorded that very hot (too loud) and distorted the snot out of their recording. It's too distorted to be the release samples of the engine. This was further complicated by the compression of audio in the video when posting to YouTube. even the doppler effect is distorted in this recording. This leads me to believe that not only did they record it too hot, but they limited the output to try to negate any clipping from recording too hot.
This is obviously operator error in the recording process.
