The factory AMG suspension is widely described as harsh, and swapping in softer G550 springs or a dedicated comfort kit is one of the most common owner modifications, sometimes considered a must-have. The FourbyFourClub G55 Comfort Suspension Kit is named specifically; on the G63, adjustable FOX dampers are cited as an alternative route to a smoother ride.
Stiff AMG ride and the comfort spring/shock swap
Mercedes-Benz G55/G63 AMG (W463 2004-2018) · driving