The Stainless Works true dual system mounts the straight-thru mufflers side by side just behind the X-pipe. The X-pipe is a vital part of the dual system that increases flow by allowing each pipe to share flow capacity. The firing order of a typical V-8 leaves some gaps in the firing order that can lessen the scavenging effect with separated pipes. With a crossover (either X- or H-type), each side can assist in those gaps. The Stainless Works true dual is a bit more "sporty" sounding than the Gibson and has a mighty bellow with the pedal on the floor.