Air Cleaner 4in x 2in Kit

The SPECTRE Air Cleaner 4in x 2in Kit is a compact intake filtration system engineered for vehicle builders and mechanics seeking to upgrade engine breathing without sacrificing underhood real estate. This type of air cleaner assembly is essential when working with modified engine bays, custom intake manifolds, or tight engine compartments where standard air filter housings won't fit. Whether you're restoring a classic car, building a street rod, or optimizing a performance engine platform, this compact design allows you to maintain proper air filtration while working around existing modifications and space constraints.

Built by SPECTRE—a trusted name in automotive intake solutions—this 4-inch by 2-inch air cleaner kit features a precision-engineered filter element designed to maximize airflow while trapping contaminants that would otherwise damage intake valves and combustion chamber surfaces. The compact footprint measures 4.8 x 3.05 x 6 inches overall, making it ideal for applications where vertical or horizontal mounting space is limited. The lightweight construction at just 0.569 lbs won't add significant mass to your induction system, and the sealed housing prevents unfiltered air from bypassing the filter media—a critical concern in high-performance builds where even small leaks compromise engine longevity and tune stability.

This air cleaner kit suits custom builders working on fuel-injected or carbureted engines where off-the-shelf solutions don't fit your intake design. It's particularly valuable when you've integrated a custom intake runner or relocated your filter housing to improve underhood airflow or engine bay aesthetics. Installation typically requires basic mechanical skill and common hand tools; the compact dimensions allow fitment in tight spots where conventional air filter boxes simply won't work. Check your specific intake diameter and mounting boss configuration before ordering to ensure compatibility with your carburetor or throttle body inlet.