About the RPI Scoops for the BMW E60 M5
RPi's Ram Air Scoops converts your factory intake system into a ram air type. Other aftermarket induction kits mostly suck in hot air causing a loss of performance. The use of heatshields are not very affective as heat shields mainly work to block radiant heat. Utilizing the stock intake boxes, expect a 10 - 15 whp gain with 70mph airflow. RPi's Ram Air systems have been dyno proven as well as track proven and come with a 30-day money back guarantee.