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 in the 2015 - 2021 WRX/STI range, you'll need to cut your factory rear bumper. Just take your time and follow the proper steps to ensure a good fit. When it comes to maintenance, treat them like your car's paint. Regularly polish the vents to keep them looking shiny. Then, apply a good - quality wax or synthetic protectant. This will not only keep them looking great but also protect them from the elements. Also, be careful not to scratch them while cleaning or during daily use. With these simple steps, your APR rear bumper vents will serve you well for a long time.