The exhaust tips will swivel down and clear a flat bumper. But I got a bumper off ebay for less than $400. Also, since I did this, there has a been an exhaust rattle at idle in gear. If you breathe on the gas pedal it goes away. It doesn't do it in neutral. I triple checked every clamp, every hanger, making sure nothing was touching the frame or the spare tire heat shield. Nothing. But there is one extra hanger on the drivers side tail pipe half way back by the spare tire. Several searches found that other people have bought the frame hanger, bolt, and rubber bushing to install it. I bought these back around Christmas, but just put them on yesterday. Putting the frame hanger on isn't terribly hard, but it is blind and frustrating. The parts needed are:
52122572AA Hanger
6104390AA Bolt This is a M8 X 1.25 x 35mm long bolt. Do yourself a favor and source a M8 x 1.25 x 20 or 25. 35 is way long and takes forever to screw in from a position that you can't see and it's hard to keep a wrench on it. A ratchet wrench works best.
52103717AB Rubber insulator
The hanger is shaped like and L and has a hook on the end away from the exhaust hanger. That hook goes in a hole on top of the crossmember towards the drivers side tire. Watch out for the wire up there....it may be the DS ABS sensor wire. Don't pinch it.
The hanger sits above the hanger on the tailpipe pointing the same way. I found several posts listing parts, or that someone had done this, but no clear pictures of how the hanger does. So I am posting this to help someone in the future.
Not great pictures, but I had to hold my phone up there and blindly take pics until I got one that showed the bolt head.
I haven't driven a lot yet, but so far no more rattling!!