Using the DC Sports Cold Air Intake for your 2015 - 2021 Subaru WRX is easy. First, gather all the hardware included in the kit. Then, remove the old OEM rubber intake pipe from your car. Next, install the new mandrel - bent aluminum tubing and attach the high - flow air filter. Make sure all connections are secure. When it comes to maintenance, check the air filter regularly. If it looks dirty, you can clean it with a filter cleaning kit. Also, inspect the tubing for any signs of damage or looseness. As for precautions, don't try to install the intake if you're not confident in your skills. It's always a good idea to have a professional mechanic do it if you're unsure.