Using this product is simple. First, make sure your vehicle is turned off and cooled down. Then, remove the restrictive OEM CAT & DPF according to the provided installation instructions. Install the FLO 20342 in its place. When installing, ensure all connections are tight to prevent any exhaust leaks. As for maintenance, regularly check the pipes for any signs of damage or rust. If you notice any issues, it's best to address them promptly. Keep in mind that this is a race - pipe, so it may not be legal for street use in all areas. Check your local regulations before installation.