I found a sound bite that is exactly like my F6B with Torque Loopz and the "Dr. Jekill & Mr. Hyde" exhaust system when in the open position.
The second sound test at 1:40, I kid you not, my F6B sound just like this when I start it, open the exhaust and I twist up the wick accelerating through the gears. I love it.
https://youtu.be/L9qZLPc1up4