Turbosmart - Kompact Dual Port BOV Suit Ford Fiesta ST 1.6L EcoBoostTurbosmart Kompact Dual Port BOV Suit Ford Fiesta ST 1. 6L EcoBoost No one knows EcoBoost better than Turbosmart. We make performance parts for every Ford EcoBoost application, but this, the worlds first aftermarket BOV for the new Fiesta ST, is truly exciting. Stock blow off valves like those that come standard with the Fiesta ST often suffer from a range of problems. They are plastic, and they leak, and if you want to up the power (who doesnt?),