The COBB Boost Controller Solenoid (BCS) allows precision boost control in a tidy package that is simple to install and tune. The BC gets rid of boost variations in the OEM boost control system, giving consistent and repeatable boost control to base the vehicle’s tune on. The COBB BCS adds the flexibility and precision needed for properly controlling boost via the factory ECU. Many upgrades to the turbocharging system (such as larger turbochargers and external wastegates) require the increased performance, reliability, flexibility, safety and installation options that the COBB BCS provides.
The COBB Boost Controller will require tuning, however if you purchase one with an Accessport the COBB OTS maps will support it.

COBB Tuning Boost Controller