what is the difference between a mercedes gls 450 and gls 550?
The base GLS 450 comes with a 3.0L V6 biturbo engine with 362 horsepower and 369 lb-ft of torque. Step it up a notch with the GLS 550 and the engine grows into a 4.7L V8 biturbo, grinding out 449 horsepower and 516 lb-ft of torque.