AEM Cold Air Intake System 21-478WR for Subaru WRX/STI/Impreza 2.5L 2008-2014

AEM 21-478WR Performance Cold Air Intake System

If you're a proud owner of a Subaru WRX, WRX STI, or Impreza WRX from 2008 to 2014, the AEM 21-478WR Performance Cold Air Intake System is your ticket to unlocking serious horsepower and torque gains. This system replaces your factory air filter and intake housing, which are often restrictive and limit your engine's potential.

The AEM 21-478WR is engineered specifically for your vehicle, ensuring a perfect fit and optimized performance. With extensive tuning and dyno testing, this intake system is designed to enhance airflow and filtration, allowing your engine to breathe easier and perform better. The oversized AEM Dryflow synthetic washable air filter sits in the original air box location and is shielded from heat, helping to maintain cooler intake temperatures while boosting horsepower.

Constructed from mandrel-bent aluminum with a striking wrinkle red powder-coated finish, the intake tubing not only looks great under the hood but is built to last. The system accommodates factory emissions control devices, including the mass air flow sensor, ensuring compliance with regulations without sacrificing performance.

With an estimated horsepower gain of up to 36 HP at 5300 RPM, this intake is a straightforward upgrade that can be installed with basic tools. Plus, the AEM filter can go up to 100,000 miles between cleanings, making maintenance a breeze.

Backed by AEM's limited lifetime warranty, the 21-478WR is a smart investment for anyone looking to enhance their Subaru's performance. Just be sure to check local regulations, as some AEM intakes may not be legal in California.

Fitment

• Subaru Impreza: 2012-2014
• Subaru STI: 2008-2011 & 2013-2014
• Subaru WRX: 2008-2014

Technical Specs

• Air Filter Color: Red
• Air Filter Height: 9.125 in (232 mm)
• Air Filter Large End Diameter: 6 in (152 mm)
• Air Filter Material: Non-woven Synthetic
• Air Filter Washable: Yes
• Estimated Horsepower Gain: 36 HP @ 5300 RPM
• Intake Pipe Material: Aluminum
• Intake Pipe Color / Finish: Wrinkle Red
• Weight: 7.4 lb (3.3 kg)
• Warranty: Limited Lifetime
• Street Legal In All US States: Yes