I just finished installing a NASA vent (best place was about 12inches before the B box. I made a whole new sheet for the modification). Still too early to see if it makes a difference, but I'll keep checking in. My BB is noisy between 45 and 60mph, but not too. Generally I can imagine just the whine on the gear reduction box for the propeller. PS I'd send pictures but not able as yet to conquer the picture mountain
