Stan's Headers 4" system here. Amazing. I have a feeling that inside the cab now is quieter than the stock exhaust. I did not want any drone at any RPM and quiet interior, with a nice deep sound. Rip said I have to run two mufflers. I have one muffler and no resonator. Muffler is 40" long straight-through Donaldson. Sounds really good. I did notice a small MPG increase, almost a gallon, and it's all made here in the U. S. I hope you get what you hope for and not end up dissapointed with too loud of a system.