Video: Hennessey-Upgraded 2014 GMC Sierra Pushes 550 HP on the Dyno

Video: Hennessey-Upgraded 2014 GMC Sierra Pushes 550 HP on the Dyno

With so much power under you foot, how much fun would a truck or SUV be with nearly 200hp more than stock, compliments of Hennessey Performance? All we can say is sign us up!

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