About This GMC Sierra Denali

2021 GMC Sierra Denali Hennessey Goliath 650

This 2021 GMC Sierra Denali is a luxury-performance pickup finished in Silver Steel Metallic with a black interior, extensively upgraded by Hennessey Performance.

Powertrain & Performance

6.2-liter V8 upgraded with Hennessey Goliath 650 Package

2.9L Whipple supercharger

Chromoly hardened pushrods

High-flow intercooler and induction system

HPE engine management calibration

517 horsepower and 525 lb-ft of torque (dyno confirmed)

10-speed automatic transmission

2-speed transfer case with rear- or all-wheel drive

Brembo performance brakes front and rear

Exterior Features & Modifications

22-inch wheels with Bridgestone Alenza tires

CarbonPro composite bed

Auto-locking rear differential

BakFlip hard tonneau cover

Hennessey exterior badging and Goliath 650 badges

Illuminated grille badge and puddle lights

Interior & Comfort

Ultimate, Denali, and Trailering Packages

Leather upholstery with heated and ventilated front seats

Heated second-row seats

Heated leather-wrapped steering wheel

Power sunroof and MultiPro power steps

Bose audio system with Kicker in-bed tailgate speakers

Console vault in-vehicle safe

Digital instrument cluster and wireless charging pad

Driver Assistance & Safety

HD surround vision camera system

Forward collision alert, lane keep assist, and automatic emergency braking

Front pedestrian braking and automatic high beams

Adaptive cruise control with follow distance indicator

StabiliTrak with trailer sway control and hill start assist

Summary

This Sierra Denali combines Hennessey’s supercharged high-performance upgrades with GMC’s premium Denali luxury features, delivering track-capable performance, impressive towing capability, and top-tier comfort. The truck is ready for both spirited driving and everyday utility while standing out with Hennessey-exclusive badging and engineering.