The FATT (Full Auto Turbo Timer) DC IV for your WRX or STi works out the correct length of time your engine should be left idling to give the turbo bearings time to cool down. The Blitz timer is based on the way the car has been driven (the engine speed is calculated by measuring the small fluctuations in supply voltage the engine produces as it runs). This takes the guesswork out of running your car after a drive and will help to keep the engine and turbo in top condition. This blitz unit also features the two-piece design that allows you to virtually mount the turbo timer anywhere in your Subaru. The FATT DC IV is available in black with silver buttons.