The sunroof is really noisy, even when it is closed. Will the sun roof wind deflector really reduce the noise? Any comments? Other than this, what is the other use of it? From the web, i see some have those air flap. Is it worth it?

I had one on our '99 Camry and it didn't do much. However, my wife had one on her Corolla (same generation) and it worked quite well. Based on that, my guess is that it depends on the size of the roof - the smaller the better. To finally answer your question - I don't think it'll give you much relief.

Take care,
Jerry

Too bad. But is there any benefit when it is raining?