BOV GEN V Race Port Sensor Cap Upgrade - Blue - TS-0204-3109 - The Gen-V Race Port 'Sensor Cap' allows you to monitor blow-off valve (BOV) position for diagnostic or tuning purposes, a true unique solution and first of it's kind on the market. If you are using BOV for traction/torque control, knowing how far it's open is paramount to providing insight to further optimise the calibration process. Aside from a calibration benefit, if you have any doubt that the BOV is not staying closed when it should be, check the logs, this has never been easier with the Turbosmart Gen-V Race Port 'Sensor Cap'