I suggest that you have your current suspension inspected before modifying it. I have a 98 E320 that has a very firm ride with no "wobbles".

What size and type of tires do you have? I am using P225 50 R16 Michelin Pilot XGT H4.

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Ray
1998 Mercedes E320, 200K Miles
2001 Acura 3.2TL, 178K Miles
1992 Chevy Astro, 205K Miles