ARH GTO systems are here to make a statement. Manufactured in 304 S/S, these headers are available with 1-3/4" or 1-7/8" primaries. Merge collectors with scavenger spikes are standard along with our bullet proof high flow metallic substrate cats. Systems are available as a direct built-in for all 2004-2006 models or choose our 3" X-Pipe option. Expect outstanding performance gains throughout the RPM range and a fit and finish second to none .