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I haven't and don't plan to. IMO a 160* does nothing to help the performance.
In a street environment you need temp in the oil to burn off contaminates. In a track setting you need even temps in the block for it to operate properly as designed. An engine that runs too cool will wear faster and not operate at the best efficiency. That's why the top guys use water heaters to get the blocks up to temp.
In a track environ, I would run a 195 stat and use the fan and coolers to keep the temps in line in order to run maximum timing 'the given reason for the low temp stat'. Even Nascar teams run about 210 on the track.
To get any kind of performance from that low a thermostat you'll need the fan on/off temps rest in the PCM. The fans are what really regulates the temp, the stat just lets it warm up faster. A 160 will cause it to warm up slower by fully opening sooner and allowing more circulation at a lower temp.
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