Using your GrimmSpeed Cold Air Intake is easy. First, make sure your car's engine is cool before you start the installation. You'll find all the necessary components in the package. Follow the included instructions to attach the intake tube, filter, and heat shield. Connect the silicone hose coupler and use the hose clamps to secure everything. Don't forget to install the MAF flange screws and the airbox to chassis bolts.
When it comes to using your car with the intake, you'll notice an immediate improvement in performance. Just drive as you normally would.
As for maintenance, check the air filter regularly. Since it's reusable, you can clean it when it gets dirty. Follow the cleaning instructions that come with the filter. Also, inspect the hoses and clamps from time to time to make sure they're secure and in good condition. If you notice any signs of wear or damage, replace the parts right away. And remember, this intake is designed specifically for 2002 - 2007 Subaru WRX, 2004 - 2007 Subaru STI, and 2004 - 2008 Subaru Forester XT, so don't try to use it on other models.