Using these APR carbon fiber rear bumper vents is a great way to enhance your Subaru's performance and style. For installation, if you have a 2018 Subaru STI Type RA, the vents are direct replacements. But for other models from 2015 - 2021 WRX or STI, you'll need to cut your factory rear bumper. Make sure to take your time during installation to ensure a proper fit. When it comes to maintenance, treat these vents just like your car's paint. First, polish them gently. Then, apply a good - quality wax or synthetic protectant. This will not only keep them looking great but also protect the UV - resistant clear coat. Regularly check the vents for any signs of damage or loose parts. If you notice any issues, address them promptly to keep your vents working well and looking sharp.