the best turbo timer out there is YOU.

About a mile before you arrive at your destination, just drive easy. It's actually more beneficial than a turbo timer, because your oil pressure is higher, and you get the additional benefit of air flow cooling. Lastly, as many have said, water cooled turbos do not really need turbo timers.

All turbo timers are just complete wastes of money, unless you possibly get one incorporated into an alarm or other accessory.