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I got a kit like that for 750 bucks. Only problem is, is that i had to find someone to actually contact do-luck japan and had them order it for me. And i think it looks great because of the stream lined look.
As for the performance.....
and this is just purely theorhetical....
but because the vents are streamlined at the top of the roof and not very big at all. it will help and pull air in. Right behind the vents located on the roof (if you look at the picture) there are other vents. What i think it does is create more of a vaccuum to pull the hot air in faster, and narrows the space devoid of air behind the rear glass, thus making the vaccuum effect a little more efficient.
That would be my guess after seeing the product up close and test fitting and taking a really good look at it.
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