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Just like everyone else said, ECM must be reprogrammed, to take full benifit of the lower thermostat. I added a 160 after my tuner told me to put one in because of the 100+ temps during the summer months. Don't harm the car during the winter.
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2004 GTO Quicksilver
2009 G8 Liquid Red
2005 CTS-V Black Raven
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