This device installs between the turbo and wastegate. Max boost is now controlled by a the ball and spring valve of the MBC. The MBC can be tightened to increase max boost, but if the MAP sensor reads an intake pressure of more than ~15.5 psi it will shut off fuel to the engine. After the MBC is installed it takes about a half hour of driving and turning the MBC to achieve max boost without hitting fuel cut off.
[[file:MBC1.jpg2pg|thumbnail|none|Manual Boost Controller]]
==Cost and Difficulty==
The instructions sound more complicated than the actual installation is.
[[file:MBC2MBC1.jpg|thumbnail|none|APC - Boost Solenoid]]