I'm going to wrap the stock M-Sport diffuser on my 530e gloss black. My car is Dark Graphite and the two colors are so close it makes the rear of the car look very frumpy. I think the visual break you get with lighter cars and the stock grey looks great (and would look even better in gloss black on those cars), so I'm hoping it'll help the rear end not seem so big visually.
I'll get this done in a month and post pics.
