Valvetronic systems are basically valve-controlled exhaust systems. Top performance exhaust manufacturers offer valvetronic exhaust systems. They’re usually controlled by a remote control or OBD gesture controller and have three modes: on, off, and automatic. When the valves are in on mode, they’re fully open for maximum airflow, allowing for more power and a better sound. With the off button pushed, the valves completely close, which greatly reduces the sound volume for a quieter drive.