2014 Shelby GT500 • JMS 2.4″ +3psi Supercharger Pulley Install & Dyno Test • +49rwhp +73ft-lbs

2014 Shelby GT500 • 2013 Shelby GT500 • JMS 2.4″ Upper Steel Supercharger Pulley JMS-24-2013-SVT Install +3psi & Dyno Test • +49rwhp – +73ft-lbs • Stock 2014…

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