This is for lancers running an Evo 16G turbo. Using the stock Wastegate actuator isn't an option with the lancer. The stock pistons and rods are to weak and cannot handle the high pressure. This spring will allow you to run a Forge Wastegate Actuator at a lower boost with your turbo. *For use with Evo 8 & 9 Forge Wastegate Actuators only*