Have just had the AmD intake fitted and, for me, it is a little too loud. I don't know how it compares to other open filter intake systems in terms of performance or sound, but compared to stock it is loud. Have heard the VWR system is a lot quieter, which is understandable as it is a closed filter - but costs £414 (on special at the moment); which is a lot when I have just spent £350 on the AmD one (although would expect to get £300 back if selling it on, as there aren't any second hand ones out there). Anyone have first hand experience of the VWR intake? Any other recommendations for quieter intakes, that still perform?