I completed this mod today myself. Due to my aftermarket aluminum radiator, I had to removed the shroud to make the install. My initial impression is that it definitely moves alot of air at idle. OAT today was 98 degrees, 85 percent humidity. After idling for 25 minutes, temp indicated 212 degrees. Increasing idle to 1500 rpms, temp indicated 200 within 2 minutes. Noise is definitely quieter.
So....if temps are a constant issue, why not drop to a lower temp thermostat?