I was gonna say, a turbo timer is what I've ALWAYS used in the past on various turbo cars I've owned in the past. It allows you to shut off the ignition, lock the doors and walk away while this little $100 box takes over the ignition and leaves the engine running for switchable preset amounts of time. It coneects to your ebrake, so if someone happens to get into the car while it's still running and doesn't have a key, the engine will die the second the ebrake is released. Wiring it into your car though, that will be the trick.

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