Mercedes-Benz GLS 450 4MATIC vs Alfa Romeo Stelvio Quadrifoglio AWD

The GLS-Class GLS 450 4MATIC AWD's 3.0-liter turbocharged I6 engine with mild hybrid drive delivers 362 horsepower and 369 lb-ft of torque. Comparatively, the Stelvio Quadrifoglio's potent 2.9-liter V-6 engine produces a formidable 505 horsepower and 443 lb-ft of torque. The curb weights of the vehicles differ significantly; the GLS 450 weighs in at 5,467 pounds, while the Stelvio Quadrifoglio is lighter at 4,309 pounds. While both vehicles offer robust performance, the Stelvio's configuration clearly targets peak horsepower and speed enthusiasts.

The Mercedes-Benz GLS-Class GLS 450 4MATIC AWD is powered by a 3.0-liter turbocharged inline-six engine featuring mild hybrid technology. This powerplant is coupled with a nine-speed automatic transmission and all-wheel drive, providing a 0-60 mph time of 5.9 seconds. In contrast, the Alfa Romeo Stelvio Quadrifoglio AWD boasts a 505hp 2.9-liter V-6 engine paired with an eight-speed automatic transmission and all-wheel drive, achieving an estimated 0-60 mph time of 3.3 seconds. The differing engine designs reflect the respective priorities of each vehicle, from refined power in the GLS to high-performance dynamism in the Stelvio.

In terms of dimensions, the Mercedes-Benz GLS-Class GLS 450 4MATIC AWD measures 205 inches in length with a wheelbase of 123.4 inches. Its width measures 79.9 inches, and its height is 71.8 inches. On the other hand, the Alfa Romeo Stelvio Quadrifoglio AWD offers more compact dimensions, with a length of 185.1 inches and a wheelbase of 110.9 inches. The Stelvio's width is 77.0 inches, and its height is 66.3 inches. These measurements depict two SUVs designed with different size preferences in mind, typically allowing the GLS more interior room due to its larger stature.