Thank you both. The -06 it is then. I also run an 07 Trailblazer E67 ECM. The lowest temp available to me is 192. There is an updated OS (2 bar) that will lower it, so I'll try and do that without-hopefully-affecting how the car runs now. My plan is to only take advantage of the lower fan table, but continue to run a 1 bar map.
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1971 Firebird
2017 SS
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