The single & dual stage manual boost controllers feature Turbosmart's unique gated boost control design but allow for user controlled activation at the flip of a switch. With the single stage boost controller, the driver uses the stock boost control solenoid and sets a secondary high boost setting with the single stage controller connected to the included toggle switch. Your 'high boost' setting is at the ready whenever you need and can be turned on or off instantaneously. The dual stage boost controllers allow the user to set two separate boost levels and toggle between the two, great for switching between 'street' and 'track' boost settings without having to get out of your vehicle. All Turbosmart single and dual stage boost controllers include a mounting bracket and Turbosmart's 'Rocket Launcher' toggle switch.