The AEM 21 - 477 Cold Air Intake System is a game - changer for your vehicle. By swapping out the restrictive factory air filter and air intake housing, it significantly boosts horsepower and torque. This system is meticulously designed, tuned, and dyno - tested to fit specific Subaru Impreza WRX/WRX STI, Forester Turbo, and SAAB 9 - 2X models. Air enters through an oversized AEM Dryflow synthetic washable air filter, which offers excellent air flow, filtration, and performance. The air filter is placed in 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 uses oil - free synthetic media and can last up to 100,000 miles before cleaning (depending on driving conditions). AEM backs this air intake system with a Lifetime Limited Warranty. Note that some AEM air intakes aren't legal in California and other states with California 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 easy. First, remove your vehicle's factory air filter and air intake housing. Then, install the new intake system in its place following the provided instructions. Make sure all connections are secure. When driving, enjoy the improved performance and power this system provides. As for 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 often drive in dusty or dirty areas, you may need to clean it earlier. To clean the filter, use a mild soap and water solution, rinse it thoroughly, and let it dry completely before reinstalling. Also, keep in mind that some AEM air intakes are not legal for use in California and other states with similar emission standards. Always check the legal status for your vehicle before installation.
