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Upgrading to a Garrett GT/GTX turbo eliminates the stock electric diverter valve through replacement of the stock turbo. The stock electric diverter valve offers limited flow potential and inadequate for increased airflow from an upgrade performance turbo.
Note, the Fiesta ST runs perfectly with a vent to atmosphere BOV and will not cause drivability issues. Although we recommend a TiAL Q Blow Off Valve for overall durability, you can use ANY brand of valve you choose and trust.
In order to prevent fault code you may disconnect the stock electric diverter valve from your ECU tune. If your ECU tune cannot disable the stock electric diverter valve, you may leave the electrical circuit plugged in to prevent a fault code. Sim- Plug may also simulate the electrical draw of an active stock electric diverter valve.
Replacement of stock electric diverter valve is necessary; and requires a high flowing mechanical or vacuum actuated valve to handle increased flow on throttle lift from an upgrade performance turbo.
TiAL Q Blow Off Valve recommended for best overall performance and reliability. The TiAL Q Blow Off Valve with 1" hose clamp style mounting flange, plugs to the 1" port provided with each ATP Fiesta ST GT/GTX turbo upgrade.