Lsd installation charge?

i recently placed my order on a 2015 m235i with the technology, premium, and cold weather packages. I also ordered the limited slip differential. Will I be paying any installation costs that haven't been discussed until the day the car comes? This is a lease and all the details money wise have been figured out. I read a thread this morning where a few guys with the lsd said they paid additional money for the installation. I tried to get some info out there but there wasn't all that much. Any info is much appreciated. Thanks.