Summary:
Conditions were better for me in 2013 with Density Altitudes of around 5900, temperature around 70 degrees F, and 0 to 6mph winds, compared to 6300, 77 degrees, and winds from 7mph head to 11mph tail, so this probably helped. As far a Dyno runs go, they were a disappointment, as the read-outs contained missing data, so I do not put much stock in them. According to my data, I would have needed an increase of 9 hp to go 9 mph faster, or a commensurate decrease in coefficient of friction.
So I believe that I did achieve a lower Cd plus an increase in hp. The longer intake, when on a dyno back East, showed a substantial increase in torque and hp at lower RPM, but no increase at the top. I put some credence in the reduced timing as well for maximum rpm. So another plus is a better acceleration when in top gear trying to get those last few mph.
We live with the fact that we only get to race once or twice a year so we have to make multiple changes or we won't live long enough to get them all in. Ideally, we would make a bunch of dyno runs to test each change, but I don't have one near enough to my build site, so that isn't an option. In the end, the lucky biker shorts win.
Tom