While factory paper filters function admirably, they can be restrictive to performance goals given the material used. They also require being replaced numerous times during the lifespan of the vehicle, which can add up to a substantial amount in maintenance costs. Limited performance and increased maintenance costs are never ideal but can be resolved effectively and economically in the case of filters. Dinan High Flow Drop-in Replacement Filters are constructed of 4 layers of cotton gauze that allow better flow and less pressure drop than the stock media. This equates to the engine not needing to work as hard to make the same, or more power. Additionally, the use of oiled cotton media means that the Dinan filters are washable/re-usable while still retaining excellent filtration and ensuring your engine runs clean for the duration.. Dinan High Flow Drop-in Replacement Filters are a direct upgrade to your factory intake system and will instantly provide better flow to assist your engine in achieving maximum performance and efficiency!. When upgrading to a complete Dinan intake system for best performance, is not available, possible, or within the budget, Dinan High Flow Drop-in Replacement Filters have you covered!. Also can be used in conjunction with Dinan Carbon Fiber Cold Air Intakes (D760-0029 and D760-0030). Less restrictive and better flowing than stock allowing maximum engine performance and efficiency. 4 layers of proprietary high flow oiled cotton gauze material for exceptional filtration. Compatible w/ Dinan Intake and Stock Air Box - E60/E61/E82/E88/E89/E90/E92/E93 (N54). Dinan High Flow Drop-in Replacement Air Filter - 2008-2016 BMW 535i/Z4 35i. Dinan High Flow Drop-in Replacement Air Filter - 2007-2013 BMW 135i/335i. General D401-0035 Filter Dimensions: 356mm x 285mm (14.02" x 11.22"). Compatible OEM Part #Cross Reference: 13717556961. Washable and reusable for the life of the engine. Direct replacement for stock air filter. Dinan 11-13 BMW 335i Air Filter. Quick and easy installation. FILTER E8XE6XE89E9X N54. Air Filter. DIN EAF

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