This is a valve with actuator to be welded in as part of a custom or jig-built exhaust in order to provide a switchable sound solution for the end customer.
 
This valve can be open or close by default so in most circumstances you will want to pair the purchase of a valve with an valve controller. This allows the valve to be operated completely by the key fob at the press of a button, to close the valves or open them again.