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About the RPI Scoops for BMW E90 & E92 335i & E92 M3
The BMW E90 E92 335i and M3 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 effective as heat shields mainly work to block radiant heat. Utilizing the stock intake boxes, expect an 8-15whp gain with 70mph airflow.