The exhaust manifolds found in the 2005-2010 Chevy Cobalt, HHR and Saturn Ion were designed to combine the exhaust gasses from each of the cylinders quickly with a manifold that was cost effective to produce. Our 4-1 off-road racing headers are designed to allow the exhaust gasses to flow more freely from each cylinder and combine in a more efficient manner. Tubing has been optimized for the 2.2L/2.4L engines. This creates a reduction in cylinder backpressure and improved exhaust gas velocity. These improvements free up lost horsepower and torque. An added benefit is a more performance oriented exhaust sound.
Precision machined steel flanges that provide a tight seal at the head and allows a high flow rate through the primary tubes Made From High Quality T304 Stainless Steel For Strength & Durability Constructed With TIG Welded CNC Machine Flange For Percision & Fitment All Tubing Is Mandrel-Bent Comes With Reducer and Metal GasketThis product is compatible with: Chevrolet Coblat Non-Turbo (2005-10) Chevrolet Coblat Supercharged (2005-10) Chevrolet HHR Non-Turbo (2006-10) Saturn Ion-1 (2004-05) Saturn Ion-2 (2004-07) Saturn Ion Red Line Supercharged (2004-07)