Description: A device, power by electricity, pneumatic, or hydraulics, used to rotate/crank a vehicle's engine as to initiate the engine's operation under its own power. Fits STI, WRX Starter Motor AY. Starter Motor You turn the key, hear a loud sharp CLICK, and your engine doesn't crank???sounds like your Subaru may need its Starter replaced. If any of these symptoms sound familiar, contact our service department. 2.5L. WRX STI. Impreza. w/ turbo. w/ sti Model.