The aFe Magnum FLOW OE Replacement Air Filter with Part Number 31-10224 is designed to deliver reliable performance and long-lasting service for your Honda Civic Si and compatible models. Constructed with a durable 100-percent polyurethane boxed frame, this filter ensures a secure fit and a tight seal to prevent unfiltered air from bypassing the filter media. The filter features three layers of progressive synthetic (dry) media, which maximize dust holding capacity and promote cleaner airflow, resulting in enhanced engine efficiency and performance. Its washable and reusable design allows for multiple cleaning cycles, reducing the need for frequent replacements and providing ongoing value. Tall, evenly spaced pleats increase the surface area for filtration, further extending service intervals and helping maintain optimal engine health. An integrated urethane bump seal guarantees a leak-proof fit over the filter's lifespan, ensuring consistent filtration performance. This filter is an ideal upgrade for enthusiasts seeking a high-quality, maintenance-friendly replacement that supports vehicle performance and longevity. Suitable for models including 2012 Honda Civic, 2013-2015 Acura ILX, and 2012-2015 Honda Civic Si, this filter is engineered to match the specifications of OE parts while offering improved filtration efficiency and durability.