The GReddy PRofec B-spec. is one of the simplest, easy to use electronic boost controllers on the market today. Available in either Black or Clear Blue cases, the B-spec uses a reliable twin-solenoid valve control motor. There are two presets labeled Lo. and Hi., as well as a Balance knob to alter the wastegate boost response. This unit also can be used with both integral/actuator or external/poppet style wastegates Good for twin and sequential turbo setups.