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1) M50d comes with self-leveling suspension, so ACS will supply you with only 2 springs for the front - the rear must be re-programmed for an equivalent drop in ride height.
2) If you want to go for the 21" - go for it, but don't try to turn an SUV into a low-rider. Neither M50d nor the X5M will ever handle like a sedan/coupe - you can't fool physics. And in all honesty - a lowered SUV looks just plain stupid. It's like buying a very warm jacket for a cold winter and chopping the sleeves off.
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