The sunroof wind deflector reduces the noise when you have your roof open. However, you will still have to close it by one notch once you drop below 50 Kph ( 30 Mph) as the noise will still be there with the roof open 100% at these low speeds. Once you are above that speed you can open the roof wide and let the sun shine in.simplesb said:I was wondering if anybody has this installed and their opinion of it. I was thinking about getting these but was told that it would cause more noise. Is that true?