2021 GLS580 suspension

Not my car. A neighbor had a 21 GLS580. Wife likes it, but he thinks the suspension is too soft. He drives a BMW M suv. Is there anything he can do to the suspension to stiffen it up? Are stiffer struts available? Larger say bars?

Not my car. A neighbor had a 21 GLS580. Wife likes it, but he thinks the suspension is too soft. He drives a BMW M suv.
Is there anything he can do to the suspension to stiffen it up? Are stiffer struts available? Larger say bars?

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