The AEM 21 - 477 Performance Cold Air Intake System boosts your vehicle's horsepower and torque. It replaces the restrictive factory air filter and housing. Specifically designed, tuned, and dyno - tested for certain Subaru Impreza WRX/WRX STI, Forester Turbo, and SAAB 9 - 2X models. Air comes in through an oversized AEM Dryflow synthetic washable air filter, offering great air flow, filtration, and performance. The filter is moved to the passenger - side wheel well to lower intake air temperature and increase power. The intake tubing is made of mandrel - bent aluminum with a tough gunmetal gray powder - coated finish. It's designed to work with the engine's factory emissions control devices, including the mass air flow sensor. The tapered cylinder AEM Dryflow air filter is oil - free and synthetic, lasting up to 100,000 miles before cleaning (depending on driving). AEM offers a Lifetime Limited Warranty. Note that some AEM air intakes aren't legal in California and other states with similar emission standards, while others are 50 - state legal. Check the 21 - 477C vehicle applications for each vehicle's legal status.
Using the AEM 21 - 477 Cold Air Intake System is straightforward. First, remove your vehicle's old air filter and intake housing. Then, install the new intake system in its place, making sure it fits well with the engine's emissions control devices. When it comes to maintenance, the AEM Dryflow air filter can last up to 100,000 miles before it needs cleaning, but this depends on your driving conditions. If you drive in a dusty area, you might need to clean it earlier. To clean the filter, use a mild soap and water, and let it dry completely before reinstalling. Remember, some versions of this air intake are not legal in California and other states with strict emission standards. So, always check the 21 - 477C vehicle applications to make sure it's legal for your vehicle.
