I'm not a New guy,but have some new guy questions. Does the stock wg actuator use vac or pressure? What does the wg solenoid due? (I know it regulates the boost) I 'm wondering the actual physical functioning of the solenoid. If a chip is setup for 20-25 pounds of boost do you have to adjust the wastegate rod to have theses boost settings or leave the rod at stock boost length and the chip modulates the power to solenoid to control flow to actuator?