A lower temp stat can be worth a little bit of performance with a complete tune and supporting mods. Mostly it is just to help the car be more consistant.
If your car had issues warming up with a lower temp stat, there is something else going on. The engine is generating the same amount of heat and transfering it into the same coolant no matter what stat is in there. So it should get up to a good 150+ operating temp at the same rate no matter what stat is in there.
-Tim
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