Replace your old and dirty air filter with a Drop-In Air Filter for your 2015-2019 Ford Transit 3.2L Powerstroke. Find drop-in filters from manufacturers like S&B Filters, AFE, K&N Engineering, and others at XDP. Most factory-style drop-in air filters are made with a paper filter media, and aftermarket performance air filters generally use a cotton-gauze media that requires filter oil, or a synthetic dry media. 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.