With that tire set up, I would be willing to bet that there are 22mm torsion bars in the front and 28s or 29s in the rear. All good for handleing, and controling rear end squat, but not good for bumps in the road.
Maybe a kidney belt would help
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'94 CMC Firebird Trans Am
'86 951 LS1 (C-2) Gone
'77 911 3.2 (C-1) Gone but not forgotten.
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