Mercedes-AMG's new GLE 63 S Coupe has 603 horsepower and sports-car acceleration numbers - here's everything you need to know about the ultra-quick SUV

Mercedes just announced a new, high-performance fastback variant of its GLE SUV.

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The AMG-tuned SUV is called the GLE 63 S Coupe, and it packs excessive amounts of horsepower and torque for a family-hauler.

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Mercedes also offers an AMG-treated GLE 53 Coupe, but its 429 horsepower looks modest next to the new GLE 63 S.

Mercedes claims the 2021 GLE 63 S Coupe puts out 603 horsepower ...

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... and 627 foot-pounds of torque.

A 48-volt mild-hybrid system called "EQ Boost" pitches in up to 21 horsepower and 184 foot-pounds of torque in short bursts.

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The heart of the Mercedes-AMG G 63 S coupe is a twin-turbocharged, 4.0-liter V8 common to lots of AMG models.

That engine allows for an electronically limited top speed of 174 mph.

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Strangely enough, the GLE 63 S actually produces more horsepower and torque than Mercedes-AMG's flagship sports car, the AMG GT R, which is rated at 577 horsepower and 516 foot-pounds of torque.

The GLE 63 S reportedly sprints from a standstill to 60 mph in just 3.7 seconds, only two-tenths of a second slower than the AMG GT R.

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To complement its juiced-up engine, the GLE 63 S coupe also gets flared fenders, a rear diffuser, ...

... and standard 22-inch wheels fitted with massive red brake calipers.

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The Mercedes-AMG GLE 63 S coupe will arrive at US dealerships this fall. Pricing hasn't been announced yet, but expect it to start in the six figures.