About AEM Air Intakes for Subaru : For years AEM has been at the forefront of the Subaru aftermarket scene, making quality air intake systems for Subaru vehicles. AEM Subaru air intake systems offer increases in both horsepower and torque, as well as offer improvements in engine efficiency and fuel economy. Each AEM Subaru air intake system is designed vehicle specific, meaning it will bolt right into your Subaru , requiring no additional modifications or parts. You can install an AEM air intake system onto a Subaru that has never been modified without needing to do anything else. AEM Subaru Air Intake Systems also will NOT void your Subaru warranty when installed correctly. AEM makes air intake systems for cars, trucks and suvs. AEM air intake systems feature AEM DryFlow air filters that are maintenance free, requiring no oil! The AEM DryFlow air filter also is 99.52% efficient, exceeding the filtration rate of most of the competition and keeping your engine cleaner. Now that you know the facts about our AEM air intake systems, isn't it time to bring your Subaru up to its potential? If you're not using an AEM intake, your Subaru may be moving, but it could be moving faster. The part number for this item is 21-732C and it fits 2015-2018 Subaru WRX 2.5 models. 50 State Legal.