how much noise etc. fortunately I am not worried about infringing upon head room just want to know what the sunroof is made of and if the deflector decreases wind noise at highway speed? I guess the radio antenna is another potential source of noise intrusion, but that has no solution.
there is the standard cover that reduses noise and you can get a wind deflector as an option to reduce noise when open. I didn't notice any wind noise on our 1st test drive, but didn't get to drive it very fast or very long.
I've had the roof open at freeway speed and it's a bit noisy. I'm going to get the wind deflector for my Murano. I'm a big guy and haven't noticed any loss of headroom from the sunroof. Out here in Arizona, I'll use the roof a lot during the fall, winter, and spring.