I love watching the smoke increase, increase, increase, increase as the pw probably stays around the same, but the rpm increases....then on a shift the rpm drops and smoke again tails, then starts building again.
A video angle like that would be nice for tuning. The only way I've ever seen that before was watching someone else going down the strip and seeing the smoke building before each shift, letting you know you could use a bit larger nozzle up top.
Or maybe the 66 is running out of air up top?
Regardless, that thing looked to be running very well, and cleaning up nicely. I just thought visually seeing the injection window getting long in the tooth with that camera angle was cool.
On Edit: It's really obvious in the middle video above.