Due to the ever-increasing demand, turbosmart now has a bolt on BOV for the Lancer Evolution VIII that will vent to atmosphere and back into the air intake. Dual ports with sequential timing allow quieter operation during normal driving loads with the benefit of a Supersonic during race conditions. Purpose built to bolt on the EVO No adapters required Supplied with a universal blanking flange to reconfigure to Plumb back or atmospheric dump only. Quick and easy fitment Adjustment via the unique Quick Wrist action (no spanners required) Supplied all hardware required for install.