Using this light bar is easy. First, make sure you have the driving lights you want to install (they're sold separately). Then, just bolt the light bar onto your 2015 - 2021 Subaru WRX or STI. It's made to fit nicely with your car's OEM bumper. When choosing lights, keep in mind that they should be up to 6.5' in diameter and 0.5' in depth. For maintenance, regularly check the bolts to make sure they're tight. Wipe the light bar with a clean cloth to keep the powder - coated finish looking good and to prevent rust. Avoid using abrasive cleaners that could damage the finish.