Using your Perrin fender shrouds is simple. First, gather all the included installation hardware and the provided installation instructions. It should take about 30 minutes to install. Just follow the steps in the instructions carefully and you'll have the shrouds on your Subaru WRX or STI in no time. When it comes to maintenance, keep the shrouds clean. You can use a mild car cleaner and a soft cloth to wipe them down. Avoid using abrasive materials as they might scratch the powder - coated surface. If you notice any loose hardware during regular checks, tighten it up to ensure a secure fit. That's all there is to it, enjoy the new look of your engine bay!