Louvers only really helped if you had a hatch without tinting so it wasn't a travelling greenhouse, or if you had no choice but to drive in the winter and it prevented the hatch from being completely coated in ice.
I had a '86 (okay, the 80's....whoopie) Nissan 300ZX that had a louver that was a godsend when a) we lived in VA and I needed to drive to work in the winter, and when I drove it all the way to southern TX in July, that louver was the only thing that kept my cats alive since the a/c died before I left the state.
Louvers would IMHO, take away from the smooth appearance of the XF.
Originally Posted by crookedview
Wow, lots of louver hate around here
. I wasn't going to get any installed, but I was watching Mecum auto auctions the other day and one of the cars had a louvered rear window. Just sparked my curiosity is all.
I wouldn't think it would interfere that much with visibility, as long as the fins were thin enough.