For Mitsubishi Esclipse 4Cyl Stainless Steel 4-1 Header+Cold Air Intake+Red Filter Application: 06-11 Mitsubishi Eclipse 4-Cylinder 4-1 Design Header / Inlet: 1.625" / Outlet: 2.25" / O2 Sensor Bung Insertion Intake Inlet: 3" / High Quality Aluminum / Improves Up to 95% Filtration Efficiency Washable/Reuseable Air Filter Instruction NOT Included, Professional Installer is Highly Recommended