I would like to hear it also, to find out if the builder linked the motors 'synch'd or 45 degrees out of sych.
The difference would be standard V8's have a cyl fire every 90 degrees of rotation. Synch's would have one cyl on each motor firing at the same time.
45 degrees out of sych would have a cyl fire on one motor, 45 degrees later the same cyl on the other, another 45 the second cyl on the first, then the second on the second, etc. It would be a much smoother power delivery. And would sound more like a 16 cyl motor.