hey guys, to shed a little light on this subject, I have the Do-Luck Rear Bumper and Side skirts at my shop. i am waiting for the wing and front bumper. The Quality is second to none. EXCELLENT Quality, almost as thick as urethane and almost as strong.
What's good about the rear bumper is that at the lower portion in the middle, it is adjustable. like an adjustable wing. It's really cool. The side skirts are just in the same quality as the rear bumper. Underneath the side skirt is a diffusor that vents the air to the sides.
If you want pics of it, I can take pics for you guys to show you what I am talking about.
Take Care
chris