Spring Tuning Kit for Turbo ActuatorsNow you can fine tune your turbo actuator to the exact needs of your engine with this complete tuning kit. In your actuator tuning kit, you will find four or five springs (dependent on your actuator) and the associated spring retainer. The strongest spring is the red, followed by the blue, yellow and finally the green which is the weakest. Please select from the options above if you require this kit for an 048 or 049 actuator. The 048 actuators are