The Greddy Profec B-Spec is one of the simplest, easy to use electronic boost controllers on the market. Available in black or clear blue case, the B-Spec uses a reliable twin-solenoid valve control motor. There are two presets labeled Hi & Lo as well as a balance knob to alter the wastegate boost response. This unit can also be used with both integral/actuator or external poppet style wastegates. Good for twin and sequential turbo set ups too.