AFE 28 10143 Magnum Shield Pre Filter XDP aFe Direct Fit Magnum Pro Dry S Performance Air Filter BMW Base 2008 AFE 28 10423 Magnum Shield Pre Filter XDP AFE 28 10033 Magnum Shield Pre Filter XDP AFE 28 10103 Magnum Shield Pre Filter XDP AFE 30 10429G Magnum Flow Pro Guard 7 Drop In Replacement Air Filter XDP. Magnum Shield Pre Filter (28 10113) by aFe. aFe Magnum Shield Pre Filters protect your performance air filter and extends your filter cleaning intervals by removing large particles from the air stream prior to the air filter. This pre filter does not restrict air flow and is made of a dry weave fabric that does not attract dirt and cleans with soap and water. aFe (Advanced Flow Engineering, Inc.) manufactures performance products for late model cars, light trucks and SUVs. The company was founded in 1999 with an initial concentration on high performance air filters. Since then, the company product line has broadened to include cold air intakes, fluid filters, exhaust systems, intake manifolds, intercoolers, programmers, differential covers, transmission pans and throttle body spacers. The team of engineers, machinists, production and sales people at aFe have many years of experience in their respective positions, and together work to ensure they produce the best automotive products on the market. Features: Extends Life Of Filter Protects Against Large Debris Slips Over The Air Filter Adds Style To Your Intake aFe Power Log Silk Screened On Pre filter 2 Year Limited Warranty