Our valve, as stated before, is not specifically designed to be a loud valve. There is no horn on it to add volume to the noise that the air makes as it vents. The only noise you will hear is just the air passing through the holes on the side of the valve. Though it is quieter than some other valves, performance of the valve is the same if not better.
As far as getting a rich condition, that should be a non-issue with our valve. The valve is a dual piston design, so under vacuum or at idle, the secondary piston remains closed thus preventing a rich fuel condition.
Mike @ Forge