I too recently installed the Hellwig and it definitely made a nice improvement on mine. It took a lot of the body roll out of it especially on some of the long curve on/off ramps on the interstate. I started on the middle hole but moved it too the stiffer hole for a bit more anti sway. Very easy...
They did a very good job on my case as my turbo actuator failed at 140 miles. The part was expedited and was fixed in less than a week . I also received compensation in the form of an extended powertrain warranty.
I like the bumper a lot and the license plate mount comes with the DV8 competition rear bumper. I have one for sale as I went with the Havoc spare tire license plate mount instead. There is 10% off for Active Military and Veterans also.