+ 1 on the WindRestrictor; you still get some airflow and it seems to cut down on the noise pretty well.
I actually have a spare that I was thinking of getting rid of; somehow it was manufactured with a reverse curve (curved in towards the driver/passenger instead of out) and I didn't realize it was wrong until I saw another. (I bought it from another member)
I talked w/ Stephen @ KingPenn about how to fix it, but wasn't excited about it, and couldn't get the correct curvature I wanted, so Stephen was very generous in getting me a new one.
Having said all that, if you're interested in an engraved WR w/ a slight defect and is straight up/down, PM me and I'll send some pictures.
I'll be out of town until Monday so I can't send any pics until then.

KevinL