2005-2006 GTO headers. CNC mandrel bent 1 3/4" primaries, , CNC laser cut 3/8" flanges, 3" collector. Includes 3" pipes to connect to factory 2 bolt flange. No cats off-road use only. The best GTO headers available-used by GM on their Orange "Woodward Cruise" GTO project. The best ground clearance and fit available. Combined with our 3" exhaust and a proper tune, Speed Inc. made 53 RWHP and 53 FT# of torque on a 2005 automatic over stock!!! Includes 02 sensor extensions required for installation.