A popular up grade is to 22/28mm torsion bars. If starting with 18.8 /25mm torsion bars this is:
18.8 to 22mm is 87% stiffer.
25 to 29mm is 81% stiffer.
24 to 29mm is 113% stiffer. (pre 86 rear)
Caution using this by itself as the sway bar may be almost half the effective wheel spring rate.
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