This is a CTS Turbo manual boost controller (MBC). It is commonly used in big-turbo 1.8T applications.
Used to dial in the boost on your custom build. The manual boost controller is typically installed between the turbocharger outlet and the wastegate.
Boost in (from turbo) is opposite of the screw, boost out (to wastegate) is at 90deg to the screw. Tighten the screw to increase boost, loosen the screw to decrease boost.
A mounting hole is provided for easy installation.
