I haven't read all 10 prior pages of this thread so I apologize if I'm posting information that is already covered here:
First off, I just installed my step and it clears the exhaust. I just had to move one section of a wiring bundle out of the way then zip tie it in place once the step was installed.
Second, and I don't know whether to be pissed off about it or happy about it: I have a 12/18 build and didn't need the nut on the stick for the third bolt. A nut was already welded in place OE so tightening up that bolt was just a matter zapping it with the impact wrench.
Here's why I don't know whether I'm happy or pissed: Happy because I didn't have to fiddle with a nut on a stick. Not happy because I fiddled with a nut on a stick for a good bit before figuring out a nut was already welded in place. Okay, I'm a slow learner, but it was very frustrating until the light bulb went on.