I too have been looking at this minor mod. But I have been confused by the spuratic responses by differnet opinions, engine sizes etc.

I live in Calgary, Alberta (Canada)

it gets to -45 + then add windchill, but can get to +30C on a good day.
I have the 3.5 Ltr SXT

don't have a tune

is this still a mod worth doing? if so does anyone have a perfered brand or is the stat a mopar peice.