BMW G80 M3 G82 M4 SpeedTune Valve Controller

• Bypass Factory Restrictions: Even in Sport or Sport Plus modes, the factory ECU automatically modulates the exhaust valves based on RPM, speed, and gear to meet strict noise regulations. The valves often stay partially closed (around 70% open) under normal driving conditions.
• Full Manual Control: A plug-and-play controller completely bypasses the ECU, allowing you to force the valves 100% open for maximum sound or 100% closed for a quieter ride on demand.
• Cold Start Management: It gives you the power to instantly quiet down loud morning cold starts or open them up immediately, all without needing complex coding tools like BimmerCode or BimmerLink.