I have the stiff old CAT springs with inverted main leaf and a Dan Walters torque arm which eliminates any trace of wheel hop but results in a very stiff ride and plenty of wheel spin. It works well in autocross (TTOD at Tigers United in Oregon last year) but I think a better system would be a modified Cal Track type bar like Jerry Porsch uses (1.40 sec 60 ft times!) You can see example of how they work at: http://www.hotrodsandhemis.com/Traction.html
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