The A'PEXi ECV (Exhaust Control Valve) allows you to control the loudness of your exhaust sound. The angle of the valve can be modified on the fly from within the cockpit to provide complete control over exhaust decibel output. Can minimize exhaust decibel level output by 10dB (depending on application) - Utilizes either a flange or pipe (weld-in) type mechanism that can be easily adapted to any existing exhaust piping