Top Speed Pro-1 muffler sound

[DFW02S]

Disregard the video, night is falling and I had to position the camera for the best sound.

First run is in 1st to 6,000 rpm's at 2:55 to 3:05
2nd to 6,500, 3rd to 6,500, 4th to 5,000 at 4:40 to 5:06
Next run is in 1st to 6,500, 2nd to 6,500, 3rd to 6,000 at 5:30 to 5:55
Next is 1st to 6,500 and 2nd to 4,500 7:06 to 7:18
the last minutes are just cruising at 43 mph 9:00 plus