Leasing/Aero Package Question

[jayjmuir]

Ditching Mercedes and signing a lease next week for loaded 2009 4.8i without the Aero Package. I really like the aggresive look of the Aero Package and asked the dealer if it could be installed prior to lease inception. He said it would take awhile to order the kit and install it, so I would probably have to wait a month or so. I am wondering if this is going to create any problems when the lease is finished. I've read on here that the vehicle needs to be turned in exactly how it was at the beginning of the lease. Also, if I am able to turn it in with the Aero Package installed, wouldn't that increase the residual value and mean that I am actually paying too much for the lease? Thanks in advance for the help.