CSF BMW F-Chassis - High Performance Stepped Core Bar/Plate Intercooler - BlackThe CSF N55 Intercooler's Stepped Core Design maximizes surface area contact and internal intake air flow volume. The Rounded Front Face Bar Plate Design optimizes airflow through the core and is a true "Drop in Fit" Plug and Play Design. Stepped Core Design for Maximum Surface Area Contact and Internal Intake Air Flow Volume Largest "Drop in Fit" Intercooler Available in the Industry Designed with 3D Scanning Rapid Prototype Technology to Ensure