, Thank you for responding,
This is the formula they used to get the tube length:
((343)/(2000 * 6 * (1/60))) / 4 = 0.42875 meters which is 16.87992126 inches.
I found the original website where they took the measurements.
I am not sure if they used the following as this one will not lead to a pipe with 16 inches:
((343)/(RPM * 4 * (1/60))) / 4
I will try to have pictures up by tomorrow to show you where exactly it is setup at this moment.
Thank you for your help!