If you have an older e30 the plastic bumper swap is not so easy and requires some alteration to fit but nonetheless can look stunning.
D-boards can also be tucked and/or painted. The tucking method involves the owner drilling the bumper shocks and compressing them to make the bumper shorter. Painting the d-boards is also a nice touch and prevents them from making small children cry during the daytime.
"Put your sun-glasses on, honey. There's a mean set of boards up the road."