Turbosmart BOV Kompact EM Plumb Back | Toyota GR Yaris | G16E-GTS | 2021+It is no secret that the Yaris GR is a high performance hatch back stomping onto the scene. However, we have found that at increased boost pressure, the OEM BOV struggles and ends up bleeding boost, resulting in a loss of power. Turbosmart has an answer to this problem. The BOV Kompact EM Plumb Back. This Blow off valve has superior boost control under high boost pressure. This means that the turbo reaches its full potential! The award winning Kompact