Using this Perrin radiator bracket set is straightforward. First, remove the old, rusty factory brackets from your 2008 - 2021 Subaru WRX or STI. Then, take the included PERRIN radiator stays and use the M8 flat head socket screws provided to install them. You can use the M5 short arm hex key to tighten the screws properly. As for maintenance, since it's made of aluminum with a brushed anodize finish, you can clean it with a mild soap and water solution. Avoid using abrasive cleaners as they might damage the finish. Keep an eye on the brackets over time. If you notice any signs of damage or looseness, refer to the warranty and instructions that came with the set. And remember, this set comes with a 5 - year warranty, so if you have any issues, you're covered.