I understand this a late post but i have these headers on my truck,they are pacesetters as they are stamped on the side,They fit great matched right up to the down pipes,Had true dual 2 chambered mufflers but lost alot of bottem end so went with a ypipe to 1 muffler now the bottem is much better,Gave it a good hp/tq gain also.I picked these because i have emissions testing and wanted to keep the egr.The ebay headers are good if you want to delete the egr which i didnt.My truck is also a 2500 so i have less restrictve down pipes as the 1500's do.