Swap out the dirty factory air filter in your 2008-2010 Ford 6.4L Powerstroke with a high-quality Drop-In Air Filter. A drop-in air filter is named after the simple installation procedure as it simply drops into the factory airbox in most applications. The air filter is a critical component in your vehicle and is designed to keep dust, debris, and contaminants out of your engine. Factory-style drop-in air filters typically feature a paper filter media, while aftermarket performance filters use an oiled cotton-gauze media, or a synthetic dry media. Find drop-in filters from manufacturers like S&B Filters, AFE, K&N Engineering, and others at XDP.