The JS Dual Stage Version I allows you to switch between 2 levels of boost with the flip of a switch or if you have a management like hondata or neptune you can control it with the ECU.

Stage 1 is your wastegate so when the switch is off your boost will be what ever your wastegate spring is.

Stage 2 is adjustable for more boost then your wastegate spring allows and works just like the single stage unit would for high boost.

Let me know how much boost you are planning on running so we can setup the boost controller to fit your needs.