Daihatsu Sirion Wind Deflectors Available Here. Wind deflectors are a simple car accessory to fit and they’re great for letting fresh air circulate around your car or van without the associated wind noise you would normally expect. They also work really well in rainy conditions and can help keep your windows from steaming up. We also show you how to fit wind deflectors to a car in our instruction video. Car wind deflectors come in a lightly tinted or smoked appearance too which make them look really stylish. The best wind deflectors you can get are heko wind deflectors which are available on our site at an excellent price.