1.5" all the way around. They are sold exclusively by American Muscle. Not sure on specs. They are usually $150 to $180 but AM has them for $100 for Black Friday so that's why I am at $80. They are brand new and never been installed.
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2014 Ford Mustang GT (aka "Vivian") - M6 Stripper. Mods: Strut Tower Brace; Roush ABs; 18" by 10" SVE Drifts with 285 Nitto NT555s.
Threaded Mode