you don't need one especially if you're conscious of how you're driving. Don't boost hard and shut the engine off. If you want one, though, I have one for sale here 
correct, its really not necessary at all in your (and most peoples) driving styles.OK so everyone is saying its good for insurance....but to let the car cool down while it is running??
I understand if I am tracking the car that I need to cool down (cool down lap)before I shut it off but in regular driving, as long as I am not racing all the way to my garage I should be ok...
I may be running the car like a bat out of hell on my way home from work but when I get within 5 min of my house, I transform in to the safe defensive driver(don't want to hit any children on my block..that would be bad). So, I'm basically cooling down the car then ..Right? I have a huge racing radiator and the water temp rarely goes high if ever.
The idea of the timer is to cool the oil that gets heated in the turbo. By keeping the oil circulating through for an extra minute or so while the temp. drops, you prevent the oil coking in the turbo.Hey guys,
My turbo is oil cooled.
It is nice, kind of gee-wiz kind of stuff. I really suck at converting celsius to farenheit though. I think it does a few other functions, but I don't pay attention to those. The problem is finding a place to mount it. I mounted mine just to the left of the steering wheel close to my cruise control switch. If I'm going straight I can see whatever it's displaying.^^ see, fancy
mine kept my car running for 1 or 3 min... thats it. lol