I Was just wonder what peoples thoughts are on this

http://www.bennetts.com/kn-apollo-universal-closed-intake-systems/kn-57a-6042-performance-intake-kit-bmw-320d-e90-e91-20d-163bhp-2218162-418330-832529.php

I know I can get the direct replacement K&N filter that's good but I will be getting the centre box removed soon and was thinking this might help add some more growl behind the sound as well as the performance increase.

http://youtu.be/UnmFNe1cC6g