Turbo XS Boost Controller - High Performance Dual Stage: The TurboXS High Performance Dual Stage Boost controller provides the ultimate in dual stage boost control. 

Two preset boost levels allow you to switch from "street" to "race" boost with the flip of a switch from inside the cabin - even while under full boost. The first stage includes an adjustable ball/spring boost controller that help you to get to full boost quicker.

This is not the Turbo XS "standard" Dual Stage Boost Controller... this High Performance Dual Stage TurboXS Boost Controller has a ball and spring 1st stage. 

A switch is installed inside the cockpit to switch between your set "High" and "Low" boost levels, on the fly.

Capable of extreme boost pressures above 45 PSI. 

Includes instructions.