Mercedes-AMG, the performance-oriented branch of Mercedes-Benz, has pulled back the veil from the new 2018 S63 and S65 models (both Coupe and Cabriolet). This new model year sees a number of changes, with the most updates being made to the engines and exterior. On the outside, both models now feature the iconic Panamericana grille that pays homage to the 300 SL that won the 1952 Mexican Road Race.

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Starting with the S63, the engine has been reduced from a 5.5-liter V8 biturbo to a 4.0-liter V8 biturbo. However, the power is rated at a monstrous 603 horsepower and 664 lb-ft of torque-- that's 26 hp more than the 5.5-liter. Laying down the power to all four wheels is the new AMG SPEEDSHIFT MCT 9G automatic transmission. When all power is accounted for and the pedal hits the floor, the S63 will rocket from 0-60 mph in just 3.4 seconds and hit an electronically limited top speed of 186 mph.

2018 Mercedes-AMG S63

Next up is the big brother S65, which retains the massive 6.0-liter V12 engine. This engine has an output of 621 horsepower and 738 lb-ft of torque. While the S65 may be the BIG brother, it can still run 0-60 mph in 4.0 seconds and hit the 186 mph limited top speed.

2018 Mercedes-AMG S65

Other than the new grille, the S63 and S65 see just a few updates, including the redesigned aero components (front bumper, side skirts and rear bumper), and OLED taillamps. Pricing has not been announced yet, but both models will have their world premiere at the 2017 Frankfurt International Auto Show.