I just ordered my 530i for pick-up in june and was considering getting the aero kit but I chose not to (I noticed it was not even on the invoice sheet). I was wondering if that is something that would be put on during manufacturing in germany or is that something that is added when the car returns to the state's. Will I pay much more to have this added later if I decide to get it? It looks like it costs around 1600 plus painting and installation. Any thoughts?????????????