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I spoke to the owner of SmartRacing years ago about what would be the stiffest torsion bar he would recommend for the traditional suspension 911 and he said he would not go higher then 22mm. Above that, you are actually pushing the maximum limits of the front suspension limits and you would incur flexing and failure of the assembly itself. It just wasn't designed to have that much resistance. Better to go with coil overs if you need more.
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