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We just go these pieces in last week. They're direct replicas of the Toyota Japan JDM wind deflectors. These pieces are very durable, made of hard plastic. They are held on by 3m adhesive and is easy to install. Here's some pictures:
I think the car's I see these most on are Maxima's and Camry's around here. I won't put these on my Lex. I just open the sunroof tilt on rainy days, the water doesn't get in. It doesn't get too hot here in the summer to the point where you can't open the windows. Sometimes the humidity is killer, but with humidity you gotta use the A/C otherwise its unbearable.