Using your Perrin radiator shroud is easy. First, make sure your vehicle is turned off and cooled down. Then, follow the included installation directions to bolt the shroud onto the top of the core support and radiator. Once installed, it will start working right away to direct more air through the radiator, helping your Subaru run cooler. When it comes to maintenance, you can periodically check the bolts to ensure they're tight. You can also clean the shroud with a mild soap and water solution to keep its powder - coat wrinkle black finish looking great. Remember, this shroud is designed for the OEM radiator. If you have an aftermarket radiator, there's a chance it won't fit, so check compatibility before installation. If it doesn't fit, we can't accept returns due to the incompatibility.