Does anyone know how the exhaust dump valve works and how it improves performance? I understand how a waste gate works in a turbocharger application and a basic understanding of back pressure as it pertains to exhaust systems and tuning. But I'm not familiar with this concept of an extra side exhaust suitable for an exhaust dump valve. Can someone give a technical explanation of how this works? Or is this more of a gimmick to make the car sound cool like the air intake inlet?