Ml550 h@r lowering springs did the trick
I am very happy with my new H@R lowering springs for my 2011 ML550. I used utilized my oem stock shocks at 54k miles. Worked great! Now i have no rear squat with serious acceleration. I have no frontend dives with full hard emergency braking. Cornering is even stiffer than stick6. Wow!. My ride is slightly stiffer then before with just these dhocks only. The 20" tires are evenly balanced throughout my wheelwells at about 3.5 inch clearance. Perfect! Recommendations, use plate type spring
So far I'm very happy with these springs.
I got these and some Koni Strt struts and replaced my oem struts and springs at the same time. I can't say which component is making the biggest difference, but my ride is extremely smooth and cornering is vastly improved. I feel way more in control of the vehicle. So far (1 week ~ 150 miles) I've seen a 3.5cm (1.4in) drop in the front and 3 cm drop in the back. If you want an improvement over OEM performance for cheap and don't want to lower your car 2-2.5 inches these are for you.