i have black ones coming.
i wasn't that difficult to get the old ones off. then when i got done i used simple green to get off the remaining adhesive.

 

Good choice! I hate those decals, I took mine off about a month ago. I'm going to put my racing stripes on eventually, well, I gotta reorder them in a smaller width first. haha.

I used goo gone on mine when I took them off-- no ghost lines either- I was lucky!!