BMW X5/X6 ///M  air intake scoops, it is directly fitting no hardware requires  , Just remove the OEM intake box and drop intake scoops and put everything back together. 
It will improve air flow in the air intake system. 

If you are installing aftermarket air intake filters, i have spectre Part # 9132  filters in the pictures. It fits and works well, no responsibilities , this is just an suggestion. 
If you put aftermarket air intakes, i would leave OEM intake Box , just remove OEM filters and air will flow in the engine bay, to cool it down. 

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High Quality Stainless Steel  316  .060 thk
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( WE DON'T INCLUDE AIR FILTER)

Please see the link below ON YOU TUBE for DYI
https://www.youtube.com/watch?v=twZp549slAo