Using this footwell illumination kit is easy. First, find the pre - arranged locations in your 2015 - 2021 Subaru WRX or STI. Then, securely install the LED lights in those spots. As your vehicle's interior lights come on or dim, the footwell lights will do the same. When it comes to maintenance, simply use a soft cloth to clean the lights if they get dirty. Remember, Subaru of America will only cover the warranty for parts installed on a car with a matching VIN, so make sure to keep your paperwork in order.