X-FLAP TVL Vacuum Exhaust Valve Controller QA

X-FLAP TVL is designed for performance cars and supercars equipped with factory vacuum-operated exhaust valve systems. Confirmed applications currently include various Ferrari, Porsche, BMW, Alfa Romeo, and Lamborghini models.
The number of valves, solenoids, and connector configurations may vary between vehicles. Please confirm the vehicle brand, model, and year to identify the correct version.

Yes. X-FLAP TVL can control the exhaust valves as long as the aftermarket exhaust retains the vehicle's original vacuum valve system and solenoid valves.
If the aftermarket exhaust uses a different valve control system or does not retain the original vacuum system, it will not be compatible with X-FLAP TVL. Before installation, confirm the exhaust valve, vacuum line, and solenoid configuration.

Choose according to the number and configuration of the vehicle's original solenoid valves.
TVL-EA3 (SW16013-03) and TVL-EA6 (SW16021-03) are for single-solenoid applications. TVL-EDA3 (SW16014-03) is for dual-solenoid applications and can control the left and right valves simultaneously.
Different models within the same brand may use different versions. Confirm the actual vehicle configuration before ordering.

A properly installed X-FLAP TVL will not cause the check engine light to come on.
Before installing or removing the wiring harness, make sure the vehicle is fully powered down. If the connectors are plugged in or unplugged while the vehicle is still powered on, a fault code may remain stored and will need to be cleared with a diagnostic scanner.

No. TVL does not change the valve position or make the exhaust louder or quieter than the original vehicle's settings.
Its function is to give the driver independent control of the factory exhaust valves, allowing the system to switch between ON, OFF, and NOR modes.

ON forces the valves fully open. OFF forces the valves fully closed. NOR restores the factory ECU control logic.
Use ON or OFF according to your driving needs. When you want the vehicle to control the valves according to the original factory logic, switch to NOR mode.

OFF mode is suitable for quiet, everyday driving. However, extended high-RPM driving, repeated revving, or aggressive driving in OFF mode is not recommended.
Keeping the valves closed for an extended period may cause the vehicle ECU to detect abnormal exhaust temperature or pressure. In severe cases, this may lead to damage to related components. When driving at high RPM or under aggressive conditions, switch to ON or NOR mode.

X-FLAP TVL does not modify the exhaust system or engine system. Before a vehicle inspection, you can switch to NOR mode to restore the factory ECU control of the valves.
The actual inspection result depends on local regulations and the condition of the vehicle.

TVL connects to the factory solenoid valve using the corresponding wiring harness. No wire cutting or modification of the factory wiring is required.
The correct version must still be selected according to the vehicle model and factory configuration.

It depends on the vehicle model. On some vehicles, the solenoid valves are easy to access, allowing owners with basic electrical or modification experience to install the system themselves.
For vehicles with limited installation space or more complex configurations, professional installation is recommended.

Some vehicles use different power signal logic and may require a polarity reversal cable.
If the controller does not power on, first confirm that the vehicle is fully powered down and that all connectors are installed correctly. Then check whether a polarity reversal cable is required for the specific vehicle configuration.

X-FLAP TVL supports both the smartphone App and the included wireless remote. Both can switch between ON, OFF, and NOR modes.
The App also provides startup default mode settings, solenoid output direction reversal (REVERSE SWITCH), remote pairing, and current valve status display. The remote is suitable for quick adjustments, while the App is designed for complete system settings.
The App supports iOS 17.0 and later, as well as Android 5.0 and later.

Related Products

• 

  X-FLAP TVL Vacuum Exhaust Valve Controller

  ---

  Many European performance cars and supercars come equipped with factory vacuum-actuated exhaust valve systems — using engine vacuum pressure to control valve position through solenoid valves. The factory ECU manages when the valves open and close based on RPM, throttle position, and drive mode. In practice, this often means the valves won't open when you want them to, or won't close when you need them to — leaving the driver with no real control over exhaust valve behavior. The X-FLAP TVL series is Shadow's solution for these vehicles. Through the app or the included wireless remote, you take direct control of three valve states: ON (fully open), OFF (closed), and NOR (return to factory ECU logic).

  ---

---