If you don't drive your car hard right before you turn it off, or drive for hours at a time, then a turbo timer is not a necessity. The purpose of the turbo timer is to allow your car to idle for a couple min, so that hot oil in a super-hot center-section of a turbocharger doesn't sit in one place and burn. Basically, If you let your car idle for a couple min before you get out of it, you'd be fine.