I installed mine and have driven it for four days. No codes, all is well. I love it. Setting 1/1-definite improvement over stock. 2/2-Quite a bit more than stock. I lusted for 3/3. It was even better! I have run 4/4, but generally run 3/3, which is more than enough. You can play with the settings, but for me, I like it with equal power and torq numbers. I haven't towed yet, but on 3/3 I don't think I'll have a problem, judging by the current temps. Do it. You'll love it!
P. S. When I keep my foot out of it, the milage increases a little as well. Haven't checked it yet. Just going "by feel. "