When installing Poison Spyder DeFenders XC's, the Inner Fender Kit provides splash protection to the engine compartment as well as a place to mount under-hood accessories. This vented version also helps promote airflow through the engine bay, helping your Jeep run cooler. The Inner Fender Kit also provides for a complete, bolt-in DeFender installation for those who either do not have their stock inner fenders or would rather sell them than cut and re-use them. Each inner fender is a 3-piece bolt-together assembly, made of CNC laser cut aluminum sheet. Please note that no accessory mounting holes or brackets are provided, as each installation is left to the discretion of the installer to decide where to mount components. Most stock inner fender-mounted components can be re-mounted to the DeFender Inner Fenders by simply drilling a hole and/or fabricating a simple bracket. Unfortunately, we have not yet found an elegant solution for retaining the stock air box, so an aftermarket air intake or open air filter element (such as a K&N conical filter) is recommended.