I'd agree with P5UML on this. Eibach springs are best value for money. The m sport suspension is really not great the body roll is way too much. Ok eibach is stiffer but looks and performance wise it's miles better.
Cheap mod considering the difference it makes without spending on coilovers.
E63 M6 - Matte Metallic Blue, BC Forged HB29's, Eisenmann Race Exhaust - SOLD
BMW 640d Gran Coupe