Headers for 2005-2008 Pontiac Grand Prix GXP! Part number THY-340-C. These headers fit the 5.3 liter engine and are not CARB legal.
These Doug Thorley headers are constructed of 14-gauge tubing with 3/8-inch flanges to give you the best quality you can get in a header! Plus they are ceramic coated to give a lifetime of performance!
