When you bolt on a 57i intake, you will notice the difference the next time you drive your vehicle. K&N 57i Gen I Intake Kits are a great way and in many cases the only way to maximize airflow and engine performance. They will replace the factory air box providing both High-Flow air filter technology and a larger air filter size. This winning combination will increase horsepower and sound great too. Quality engineered and designed to last the life of your car, each kit includes all fittings and easy to follow installation instructions.