With the AFE Magnum Force Stage 1 Cold Air Intake System, AFE replaces the stock air box and the stock air filter. By replacing the restrictive air box and air filter, there is a noticeable improvement in airflow and power. However, the AFE Magnum Force Stage 1 Cold Air Intakes retains the stock air intake track. The AFE Magnum Force Stage 1 Air Intake Systems is available with the Pro 5R, Pro-Guard 7 or the Pro Dry S radial universal clamp-on filters. AFE cold air intakes are designed in an inverted top on some of the filters on the Stage 1 systems to increase filtration surface area and airflow. One of the special characteristics of our AFE Magnum Force Stage 1 Air Intake filters is the full or modified velocity stack that is built into our universal cone filters. This velocity stack allows the air to curve around the edge of the filter and enter the intake track without loss of velocity. AFE has conducted many tests where there is more airflow with a full-velocity stack filter than with a straight tube and no filter. With the installation of an AFE Magnum Force Stage 1 Air Intake System, you are removing the most restrictive part of the stock air intake system: the air filter and air box. You will feel an immediate improvement in acceleration and throttle response. The dyno chart above attest to the increase you can achieve with one of our popular applications.