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Message: <blockquote data-quote="Devillian" data-source="post: 651922" data-attributes="member: 22102"><img src="http://i1159.photobucket.com/albums/p621/chanseewai/My%20E39%20M5/SCAN0117_zps9f0f84dd.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The owner has done a before/after dyno of the kit, and here we have the results - with no significant gains over the stock. If anything, at certain bands it seems to lose power. The runs were done side-by-side, and all other variables - temperature, humidity, etc remain equal.So would reason that the stock ///M air filters and piping are already capable of keeping up with the engine's natural demand for air. So an aftermarket air intake MAY be capable of handling more flow, but if the engine doesn't need it, it wouldn't make a difference.</blockquote>