No just give your car a minute of light driving or idling after hard use before turning it off. The expansion tank is like the oem equivalent of a turbo timer, keeps coolant circulating so the turbo doesn't cook the oil.So my car is a turbo'd RS. Do I need to have a coolant expansion tank on it??? Like what the WRX/STIs have always had? I'm more than happy without one and temps have been fine but it hasn't seen track time yet.