Using these sidemarkers is easy. Just replace your factory orange sidemarkers with these OLM SubiSpeed ones. You can do it when you're working on headlight upgrades. For customizing, you can blacken them out if you have a non - limited WRX, add C - lights, or retrofit projectors. As for the hazy look under artificial light, don't worry; it won't be an issue in real - world use. Before you seal your headlights, make sure to clean the lenses properly. This will help keep the sidemarkers looking great. To see what the installed product looks like, refer to the provided pictures. If you want to learn how to open your headlights for any modifications, watch the SUBISPEED HEADLIGHT UPGRADE VIDEO.