The K&N Filtercharger Injection Performance Kit provides exceptional air flow combined with outstanding filtration! Unlike factory intake plenums and filters that restrict incoming air flow, the Filtercharger Kit drastically reduces intake restriction while smoothing and straightening air flow. This allows your engine to inhale larger quantities of air, enhancing usable power and torque throughout the engine's rpm range. And if your engine is turbocharged or supercharged, the power gains can be phenomenal, as these engines are very sensitive to intake air flow.