I just got mine out for the very first time today and it seemed to have very little effect ?
I'm fairly certain it is correctly installed (it would be hard to get it wrong!) and unlike my old 911 (where the difference was properly noticeable) I found it not much different
yep! nice bit of sun roof down wind deflector in place. Bit of buffeting maybe, doesn't get worse as speed increases, stays constant?? Enjoy that noise!