If you've got a race car, go for the 160. If it's a daily driver, you should keep the 192. In any case, don't go lower than the 180 (unless it's a race car). It was designed to run hotter. The gains you will see are minimal, but the damage that will occur is greater. You will thin out your oil, ruin your bearings, clog your cats, and cut the lifespan of your engine by 1/3 to 1/2. But hey, it's only money, right?
I'd leave the 192 in.
Take care,
-Chris
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