For actual offroad you're going to most likely wanna stay with the stock setup. You can weld in a muffler in the place of the stock one though. I have duals under the bumper and I thought I was going to knock it up on a steep hill but instead it was my trailer pin connector that got bent up.
Borla's don't hang down low BUT they are big tips that will really decrease your departure angle.
As for sound, I love it and wouldn't have it any other way. Loud enough to make people turn around and look but not too loud that it would wake hte neighbors, unless you got on it. It's hte best of both worlds.
-rockstate