I am using the Greddy e-01 to control boost on my Stage 2 without Toys. Because I live in a cool climate, The Stage 2 PCM would not allow me to boost over 15psi. As a result, I wanted to take over control of how much to boost. With the Greddy e-01, you will need the AGP WGA. The e-01 does not work with the Stage 2 WGA. Chad (SY04SRT4) did the install and tuning on my car. The e-01 is set to run three boost settings--(OFF) position which is just the AGP WGA spring pressure of 12psi, (LO) is around 16psi, and (HI) which is between 18 and 19psi.