Dryflow Cold Air Intake System

The AEM 21-478WR Cold Air Intake System is engineered to significantly enhance the performance of compatible Subaru WRX, WRX STI, Impreza WRX, and Impreza WRX STI models. This system replaces the restrictive factory air filter and housing, allowing for greater airflow into the engine. The design has been precision-tuned and dyno-validated to improve throttle response, sharpen acceleration, and boost overall engine efficiency, leading to substantial horsepower and torque gains. The core of this intake system is an oversized AEM Dryflow synthetic washable air filter. This filter provides exceptional airflow and filtration and can last up to 100,000 miles before requiring service, depending on driving conditions. The filter media is oil-free, which simplifies maintenance and ensures consistent airflow. A heat shield is integrated into the design to minimize intake air temperatures, further contributing to horsepower gains. The intake tubing itself is constructed from mandrel-bent aluminum, finished in a durable textured red powder coat for both aesthetics and longevity. The system is built to accommodate the vehicle's factory emissions control devices and mass air flow sensor, ensuring continued compliance and proper engine management. The AEM 21-478WR also produces a deeper, more aggressive induction tone, adding an auditory enhancement to the performance improvements. This cold air intake system is legal for use in all 50 US states. It comes with a limited lifetime warranty and includes all necessary mounting hardware, 3 steel clamps, and 1 coupler.