When turbo exhaust back pressure increases, the stock actuator prematurely blows off the seat, softening boost in the mid range and killing torque. With twice the diaphragm area and spring pressure of the stock waste-gate, Banks BigHead Wastegate Actuator keeps the valve seated longer and achieves a higher peak boost, sooner. At peak, BigHead opens the waste-gate and holds its position, for precise boost control that gives you crisp acceleration and more mid-range pulling power.
