Using this DC Sports intake kit is a breeze. First, gather all the hardware that comes with the kit. You don't need to modify or cut anything, so just follow the included instructions to replace the old OEM rubber intake pipe with the smooth aluminum tubing. Connect the high - flow air filter to the tubing. When it comes to maintenance, check the air filter regularly. If it looks dirty, clean or replace it according to the manufacturer's guidelines. As for installation, make sure you're in a well - lit and safe area. And always double - check that all connections are secure to avoid any air leaks. With these simple steps, your intake system will keep your 2002 - 2007 Subaru Impreza WRX/STI running great.