This K&N Filtercharger ® Injection Performance Kit (hereafter referred to as: FIPK) is designed to be less restrictive than the OEM air filter system. Low restriction air filters allow the engine to have better throttle response as well asmore power throughout the RPM band. K&N has designed this FIPK to exactly replace the OEM factory air cleanercase, with a precision engineered aluminum adapter and all the necessary mounting brackets, bolts, screws and nuts.Additionally, it is important to note, if the O.E.M. air cleaner case has emission control devices and/or hoses, that allthese parts will be installed as necessary to the new assembly. Each FIPK has a specially designed filter with woven cotton fabric sandwiched between 2 layers of wire mesh screen.The screen and fabric combination creates a grid-like effect which actually straightens out the incoming air as it passes through the filter. In addition to the filter, this kit has a uniquely designed adapter with a built-in velocity stack.This velocity stack is beneficial in further smoothing out the incoming air flow and allowing for a less restrictive entryinto the engine. (Air moving in a straight direction moves faster than tumbling air thus creating an increase in air flow).See the figure below.