Now the whole family can ride in style with upgraded Sienna Turbo Timers. Keep your turbo from prematurely extinguishing with a Turbo Timer. Sienna Turbo Timers are a great upgrade. The Turbo Timer keeps the engine idling after the key has been taken out. Sienna Turbo Timers are of the highest quality. A Turbo Timer allows the oils to cool down without harming your turbo. Take care of your engine today and get a Turbo Timer.