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They look ugly and don't really do anything, as there's already a small built-in flip-up deflector when you slide back the sunroof.
Not necessarily true that they don't do anything. I have one on my 4Runner and there is significantly less noise with the sunroof open after I put on the deflector (I realize it isn't as aerodynamic as the 350). I don't know how the 350 is, but I had an '01 Avalon with the pop up deflector and at high speed it bounced up and down creating this oscillating thumping noise. It sounded like you had a flat tire - quite annoying. I, too, have been wondering about the deflector, but, was afraid it would detract from the looks of the 350. Probably just run the AC or seat temp., but it is so much nicer to feel the "fresh air".