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A boost controller is an option on the V-6 kit, and John opted for the Turbosmart Boost Tee ($80). The Boost Tee manually dials in boost, but electronic controllers are also optional. The boost controller regulates the boost pressure fed to the wastegate actuator, thereby controlling the boost level. If you have a stock engine, it's probably a good idea to go with the manual unit under the hood so you aren't tempted to dial in too much boost.