check your owners manual or manufacturer's invoice. It will say if you have self leveling. Also you can look in the trunk where teh fuses are and see if you have a fuse for the self leveling rear. If there is no fuse in the spot for self leveling rear, means you dont have it. (unless someone took it out, but I doubt that). You can also call into your local BMW dealership and ask for Service and give them your VIN. They will tell you if you have self leveling rear or not.
I dont think there is a 745Li sport package. they only came for 745i.
I would reccomend you get Eibach springs though. 1.2" drop all around. The H&R springs at 1.3"F and1"R will leave you looking like a drag car.
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