I was under mine last weekend looking at that. Thought it would be easy until I crawled under...EEEEEoWQWWWWW! Not an easy one. That exhaust sure throws a curve ball at ya.
Still pondering how I am going to do it, so maybe I can learn from your trial/error/success.
Looking at the back, wonder how much drag the rear bumper cover is causing by hanging down so low. Do you thing a rear bumper modification, with a more upswept under pan would help?