ACTIVE CURVE SYSTEM
BTW, I have Off Road and given recent weather in NE, it has been extremely good even with OEM 21" tires.
The GL450 w/o it is "floaty", sometimes I do regret not getting it on local drives, but then the $3500+ saved brings a bit of comfort
Would never buy another MB SUV without it.
I love to drive like many of us here and it's a difference that can be felt, especially on a big car like the GL. Even my wife notices the difference.
If you're not that specific about handling, don't get it. You'll never know the difference.
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