Adjustable Actuator for Ford Fiesta ST180Fully serviceable and tuneable replacement turbocharger actuator for the Ford Fiesta MK7. 5 ST180. If you require this actuator to be assembled with a standard spring suitable for the factory boost level please select Green Stock Vehicle from the drop down list. If you require a stronger spring please select the required spring in the drop down menu. Green Stock Spring Purple 13 Psi (0. 9 bar) Yellow 15 Psi (1. 03 bar) Blue 18 Psi (1. 24 bar) Red 20