This manual boost controller is CNC manufactured out of one piece billet 6061 aluminum. The design incorporates both a ball-and-spring as well as bleed for full control over tuning boost curve on either internal or external wastegates, single and dual port actuators. The heart of the Billet Boost Controller's design is its click-adjustable knob for precise adjustment when increasing or decreasing boost. The BBC comes with boost/vacuum line, a mounting bracket, three air bleeds, wire ties, and detailed installation instructions.