The Synchronic BOV is designed to be open under low load conditions. The Anti-Stall kit is designed to prevent unmeasured air from being sucked in, or metered air being blown out of the engine. If you are running an efficient turbo, the charge pipe pressure may be higher than the spring keeping the anti-stall kit sealed, and is causing the excess air to be blown out of the BOV. While the intake manifold is under boost, the valve is closed and will not open again until the intake manifold pressure drops. We highly recommend re-circulating the BOV discharge back into the intake piping before the turbo, and after the MAF sensor.