2012 sport Bought a hitch from hitchsource. When trying to insert bolts the muffler gets in the way. I can get one of them in but the angle isn't straight enough to allow all the bolts to go in. The muffler is in the way. The instructions(yes I read them) say to lower the muffer for easier installation. If I can get just one side down a little it will work but I can't figure out how to unattach the rubber holders. Any thoughts?