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Now that I have HP Tuners, and have seen the tables on how much timing gets pulled at relatively low IAT and ECT's (it is several degres) the cool weather you had in the dyno room had a nice effect on your great numbers. But great numbers anyway!
If you want good HP numbers stock dyno it this winter. The dyno correction factors cannot correct how much timing our C6's pull for low (in my mind) temps.
I you want to see the tables yourself look at the Torque Management thread in the C6 Scan and Tune section.