Luxury meets performance in this Hennessey H600 GMC Sierra Denali Ultimate. Finished in sleek Onyx Black, this supercharged Sierra packs a thrilling 600 horsepower upgrade—turning one of the most premium trucks on the market into a true powerhouse. With unmatched refinement, aggressive stance, and the reliability of Hennessey engineering, this truck delivers the best of both worlds: first-class comfort and jaw-dropping performance. This particular H600 Sierra is FOR SALE and ready for its next owner. If you’ve been searching for a rare combination of capability, power, and luxury, look no further.