Here are a couple pictures before and after install. Hard to see much but figured I'd share since there is so much back and forth on what works. To install I only removed the 3 nuts on the flange, 2 nuts sliding coupler and 2 nuts on the hanger off the muffler. Repeat the same on each side of the car. I did not remove the muffler or anything else. I did remove the wheel for easier access to the flange nuts.
Stock

Stock

Top Speed

Top Speed