AEM Induction Cold Air Intake System

Fitment: 2008-2014 Subaru WRX/STI

Part #: 21-478WR

Overview

The AEM 21-478WR Cold Air Intake System is a high-performance upgrade designed specifically for Subaru WRX, WRX STI, Impreza WRX, and Impreza WRX STI models from 2008 to 2014. This system replaces the factory air filter and intake housing with a streamlined, high-flow design that enhances airflow and engine response. Crafted for enthusiasts seeking improved horsepower and torque, the intake helps optimize your vehicle’s breathing, supporting better acceleration and overall engine efficiency. Its durable construction and precision tuning ensure reliable performance and long-lasting operation, making it an ideal choice for both daily driving and spirited driving experiences. Whether you're looking to boost your vehicle’s responsiveness or improve its sound, this intake system offers a noticeable upgrade over stock components. It is engineered to deliver a more aggressive intake sound while supporting your vehicle’s performance potential, all without sacrificing filtration quality or durability.

Key Features

This intake system features a high-quality synthetic washable air filter that provides outstanding airflow and filtration. The oversized AEM Dryflow filter is designed for easy maintenance and long-term use, helping to keep dirt and debris out of your engine while maximizing airflow. The intake tube is constructed from durable materials, designed to withstand heat and harsh conditions, ensuring consistent performance. The system is engineered for a direct bolt-on installation, requiring no additional modifications, and fits precisely to your vehicle’s existing mounting points. Its sleek, aerodynamic design not only improves airflow but also enhances the engine bay’s appearance, giving your Subaru a more aggressive and refined look.

Construction & Design

The intake features a robust, high-quality plastic and silicone construction that resists heat soak and maintains optimal airflow. The oversized Dryflow synthetic filter is engineered for maximum dirt holding capacity and washable convenience, ensuring long-term performance and ease of maintenance. The design emphasizes smooth, uninterrupted airflow paths to support engine response and efficiency.

Driving Feel & Feedback

Installing this cold air intake helps improve throttle response and engine sound, providing a more engaging driving experience. The increased airflow supports better acceleration and a more aggressive intake tone, enhancing the overall driving feel without compromising reliability or drivability.

Installation & Fitment

Designed as a direct bolt-on upgrade, this intake system requires basic tools and no additional modifications. Proper fitment should be verified against the vehicle’s specific model year and configuration to ensure compatibility.

What’s Included

The package includes the oversized Dryflow synthetic washable air filter, intake tube, silicone couplers, clamps, and all necessary hardware for a straightforward installation.