Replace your old and dirty air filter with a Drop-In Air Filter for your 2003-2010 Chevy/GMC Kodiak/TopKick 6.6L Duramax. Find drop-in filters from manufacturers like S&B Filters, AFE, K&N Engineering, and others at XDP. 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. The air filter is a critical component in your vehicle and is designed to keep dust, debris, and contaminants out of your engine. A drop-in air filter is named after the simple installation procedure as it simply drops into the factory airbox in most applications.