Description
The K&N Filters 57S-4521 Performance Airbox System is designed to reduce air flow restriction and improve air flow characteristics. This performance airbox replaces the factory air filter and air box, allowing your engine to inhale more air, which can lead to increased power and acceleration throughout the engine’s RPM range. The fully enclosed injection molded air box connects seamlessly to the factory air intake hose, ensuring a smooth installation process.
One of the standout features of the K&N 57S-4521 is its removable lid, which provides easy access to the filter for cleaning. This convenience makes maintenance straightforward, allowing you to keep your air intake system functioning optimally. The installation of this airbox system is relatively easy, utilizing commonly available tools and the existing air box space. K&N builds these systems to last, ensuring that they can withstand the demands of your engine for the long term.
Features
- Designed to reduce air flow restriction
- Injection molded air box connects to the factory air intake hose
- Removable lid for easy filter access and cleaning
- Relatively easy installation with commonly available tools
- Built to last for the life of your vehicle
- Includes mounting hardware and mass air flow sensor adapter
Frequently Asked Questions
What is the purpose of the K&N 57S-4521 Performance Airbox?
The K&N 57S-4521 Performance Airbox is designed to reduce air flow restriction and improve air flow to the engine.
How does the removable lid benefit maintenance?
The removable lid allows for easy access to the filter, making cleaning straightforward.
What tools are needed for installation?
The installation of the K&N 57S-4521 requires commonly available tools.
Manuals & Instructions
âš WARNING (California Proposition 65): WARNING: Cancer and Reproductive Harm – www.p65warnings.ca.gov

Not CARB approved. This item is not legal for sale or use on pollution-controlled motor vehicles in California or states that adopt California emissions standards. Intended for off-road / competition use where permitted by law.











