How many miles does your car have? When is the warranty expiring? Is the vehicle xDrive or RWD?
Lowering springs do not attract much attention, unless of course the dealer believes the lowering springs may have played a role in a component failure: typically _anything_ in the suspension ecosystem and sometimes drivetrain as well.
If the warranty is about to expire, the decision is simpler. I suggest to match lowering springs with shocks designed for shorter springs. Or - consider coilovers.
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