Exhaust system and device to induce improved exhaust gas mixing prior to treatment through a catalytic converter

A exhaust system for an internal combustion engine, comprising

• an exhaust stream conduit having a length with an inlet and an outlet, an exhaust gas stream sensor, a particulate filter having connected at an inlet to said conduit and having an outlet;
• and
• an exhaust gas mixer having a body having opposed first and second ends in spaced apart relation to each other and separated by a low pressure zone, said first end having an inlet and said second end having an outlet, said body having an inner surface and an outer surface extending substantially unbroken between said opposed first and second ends to define an interior;
• said inlet and outlet each having a diameter substantially equal to an exhaust conduit diameter;
• said body further equipped at its first end with a first exhaust substrate having a herring bone configuration and a second exhaust substrate having a herring bone configuration at its second end;
• said first and second exhaust substrate separated by said low pressure zone, and positioned out of orientation relative to each other such that one substrate imparts turbulence, mix and swirl to an exhaust gas stream in an X-Y plane, and another substrate imparts turbulence, mix and swirl to the exhaust gas stream in an X-Z plane.