I have a 06 3500 Mega Cab w/G56, my intake is stock my exhaust has a muffler delete and a cat test pipe, so basically straight 4" from turbo back. I got a 06 smarty, played with it alittle with no load (great product :-laf ) but this week I am hooking up a 10,000# trailer with temps below freezing what setting can I set the Smarty on safely being I don't have an EGT installed (yet). I am in Minnesota, no long hills and I drive pretty easy.