Upgrade the air filter in your 1994-1997 Ford 7.3L Powerstroke with a new Drop-In Air Filter. 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. XDP carries drop-in air filters from manufacturers like S&B Filters, AFE, K&N Engineering, so you can find the best one to meet your vehicle's needs. Drop-in air filters are aptly named as they have a "drop-in" installation that allows them to fit inside of your factory air box. Air Filters provide your engine with clean air by trapping harmful contaminants such as dust and debris before entering the intake.