All Direnza air induction systems are designed in-house by Direnza engineers. Designed to replace the OEM BMW airbox, offering more surface area compared to the standard filter and significantly enhancing air flow into the 3.0l diesel engine boosting your car's soundtrack and performance. ---Crinkle wrapped heat shield ---Supplied with a high quality cone filter ---Powder coated alloy pipework ---Engineered to improve throttle response ---Increases power and torque across the rpm range Fitment BMW 3 Series E90/E91/E92/E93 335D 2005-2013 models.