4-1 Racing Sport Exhaust Header for Saturn 04-07 05 06 Ion-1 Ion-2 2.2L L4 Get better fuel mileage and gain more performance due to high air flow. Inlet/ Outlet Diameter: 1.625" X 0.875" (Oval)/ 3.250" Increase Horsepower and Torque Professional Installation is Highly Recommended (No Instruction Included) Application: Saturn 2004 - 2005 Ion-1 2.2L Non Turbo Only/Saturn 2004 - 2007 Ion-2 2.2L Non Turbo Only