I saw pics of your car and it really looks nice. At first I thought it had black stripes and the stripe was shining in the sun. I looked at it closer and realized that it was silver.
The silver stripe doesn't look bad but it's not factory. Do you have any of the paperwork with the car? That will tell you if the car came with white/black or no stripe.(I assume the stripe could be deleted?)
Personally, I think a black stripe on a black car is an amazine combination.