What is a Railgun? Four Things to Know about Railguns Turbosmart Kompact BOV Blow Off Valve Dual Port. A direct fit high performance replacement for the factory all plastic unit, the Turbosmart Kompact BOV suits the Hyundai i30N. The Turbosmart unit is made of billet aerospace grade aluminium with high temperature seals that allows for minimal leakage and a complete seal across the bypass aperture providing as much performance as possible. Benefits include: Direct fit upgrade for the factory BOV on Hyundai i30N Packaged with a blanking plug to switch the unit into pure vent to atmosphere or plumb back modes All billet CNC construction and attractive anodized finish Manufactured, assembled and validated in house at Turbosmart HQ