hey that car ^^^^ looks familiar - o wait it's in my garage.
Louvers are great! Just washed my car for the first time yesterday with the louvers- they wash great, and dry well too. and very easy to wash window under neath using the prop rods. I highly recommend to those wanting to stand out.
Also went 135 mph between Waco and Buffalo, TX - no rattle what so ever.
Another point - when i drive to work - it sits in the sun - i've noticed a GREAT amount of difference of temperature difference having that big back glass shaded all day while at work.