just thought id put my thoughts forwards on turbo timers. i bought i scooby couple of years ago and it already had one fitted really cool i thought, had it set for 30secs, got loads of odd looks when leaving a running car, one thing you will be peed off when filling up had loads of attendants refusing to turn pumps on as car was running!. also fitted cat 1 alarm but any insurance rating was canceled by tt. (however autowatch and i think clifford offer a tt on their cat 1s). i always thought that the timers were to let the oil cool down before turning off so it doesn't cook the oil. NOT TRUE oil is quite happy at high temp and will not be damaged if left hot. this came to light after i was discussing it with a friend (ex cosworth and Ferrari F1) the timers are used to stop oil starvation on start up. when an engine is running as the pistons are going up and down they create a vacuum in the sump, hence a breather system, but if the car is being driven hard then turned off straight away before the vacuum has a chance to dissipate then the vacuum will suck the oil back into the sump from the oil feed to the turbo so next time the car is started there will be no oil at the turbo this will obviously shorten the life of the turbo. so all you need to do is drive slowly for last mile or so and just let the car run for a few seconds before turning off leaving for longer just raises the temp under the bonnet (not good)