Stangman,
This is SUCH a great thread - keep it going!
I just followed it thru with the Gonkulator as best I could.
Very interesting - the parts where you ran with/without air cleaner and mufflers.
Gonkulator says your air cleaner costs about 10 Net HP, mufflers cost about another 20 Net HP.
(note neither one of these affects GROSS HP).
Also the Gonk thinks the Med Riser intake is adding 28 ftlb and 34hp, now peaking at 6000 instead of 5800.
I had been shifting the Gonkulator at 6400, and raising it to 6600 only gained .01 sec and 0.1mph so no point revving it to the moon.
Mainly, if you can take note of the weather, and even the WIND - it affects the MPH a lot with a brick-like car that fast. Even a walking-speed wind of 4mph will cut over 1mph off your trap speed.
Even on my little 300-400hp GTECH runs, I always note the Temp, Pressure, Humidity, Altitude, and wind.
With the kind of traction & launches you've already done, combined with decent weather, the car Gonkulates 10.83-10.93 at 123-124mph, all shifted at 6400.
So great to follow all this.