Cosmetics sell cars, it doesn't have to function or even work well, if it looks fast people will buy it, Nissan are smart, just like a lot of the aftermarket suppliers.
And I have been speaking from experience, have a look under the bonnet of a WRX, the alloy corrosion, the moisture getting in the electrical joints, its a PITA, but feel free to disregard this as it seems you want one, if you don't take it out when its raining you will be fine, it would be good for letting out heat when your stopped in traffic though.