Using this Injen air intake system is straightforward. First, make sure your engine is turned off and cooled down. Then, carefully install the intake according to the provided instructions. When driving, enjoy the enhanced power and the exciting intake growl. As for maintenance, regularly check the air filter. If it's dirty, clean or replace it as recommended. Keep an eye on the intake tube for any signs of damage or loose connections. When it comes to the A/F ratio, if you notice any performance issues, it might be a good idea to have it checked by a professional. And always follow the manufacturer's guidelines for long - term use.