I have the same exhaust and I read and saw the video before installing mines and before you tighten up the exhaust, you have to jack up around the x pipe area while the bolts still loose and push it up far as you can, then tighten the bolts.
In addition, I brought another tunnel brace from elite for extra clearance.
I had my exhaust on for almost a year and no rattling noise.
Hope his helps
