worst mod: turning my truck into a Mexican xmas tree when I went through my peel n stick chrome phase.
best mod: my rear bumper. This thing took me forever to make - 3/16" carbon steel plate with textured black powdercoat, accommodates a Gorilla Silverback Series 10,000 lb rated winch, 6.5 ton rated shackles and tow hook powdercoated red, a pair of 4" offroad lights, air hook up for pneumatics, 110v outlet, rear camera with night vision, custom drop hitch and a swing away tire carrier covered in line-x complete with 5 gal jerry can, hi-lift jack, and 40" spare. I've never put so much time and effort into anything I've fabbed and welded up. Pics are in my garage.