K&N 2015 Chevrolet Silverado / GMC Sierra 2500/3500HD 6.6L V8 Performance Intake KitThe K&N 57 3087 FIPK air intake system replaces your vehicle's restrictive factory air filter and air intake housing. K&N intakes are designed to dramatically reduce intake restriction as they smooth and straighten air flow. This allows your engine to inhale a larger amount of air than the factory air filter assembly. More air means more usable power and acceleration throughout the engine's RPM range. The 57 3087 air intake comes with a K&N high flow