The 2015 Mercedes-Benz S63 AMG 4Matic Coupe loses 140 pounds but gains 41 horsepower.

Catch it if you can.

We got our first look at the all-new Mercedes-Benz S-Class Coupe a few weeks back at the Geneva Motor Show.  What could be the ultimate version of the top-line two-door will rocket into the next big event on the auto circuit when the Mercedes S63 AMG 4Matic Coupe makes its debut at the New York Auto Show in April – before reaching U.S. showrooms this coming autumn.

As with the only slightly less exclusive S550 Coupe, the S63 AMG picks up on the dynamic appearance of the S-Class Coupe Concept Mercedes first unveiled in Detroit at the beginning of the year.  And like the S550 Coupe, the AMG edition adopts a more athletic stance than the S-Class sedan – even as it abandons the old CL nameplate.

You might be tempted to call the S63 AMG Coupe a lightweight, and in one critical sense you’d be right. Through a variety of steps – from the extensive use of aluminum to the new lithium-ion battery – Mercedes engineers have shaved 140 pounds off the weight of the new two-door.  But don’t think that makes it a pushover.  Not with its 5.5-liter biturbo V-8 punching out a full 577-horsepower and 664 pound-feet of torque through all four wheels.

The S63 Coupe's new 5.5-liter biturbo V-8.

“The new S63 AMG Coupe is another exciting AMG dream car in the luxury segment. Now the S-Class Coupe also comes with performance-oriented AMG 4MATIC all-wheel drive – as we rigorously pursue our all-wheel-drive initiative,” says Tobias Moers, Chairman of the Board of Management of Mercedes-AMG GmbH.

Going forward, virtually all AMG models – but for a few exceptions like the SL and SLR – will be equipped with the 4Matic all-wheel-drive system.

(New Mercedes-Benz S550 Coupe throw an (active) curve. Click Here to check it out.)

The new C63 AMG delivers a hefty 41 hp and 74 lb-ft more than the outgoing model. That’s all the more significant in terms of its power-to-weight ratio. The 2015 model adopts a new aluminum outer skin and front end.  Additional weight savings come from the lithium battery, composite braking system – and optional forged alloy wheels.

Expect to have a quick finger on the stopwatch, the new model launching from 0 to 60 in a mere 3.9 seconds, with an electronically limited top speed of 186 mph.

The modified 4Matic system directs 67% of the big V-8's torque to the rear wheels.

Power is channeled through a 7-speed sport transmission and the modified 4Matic system deliver 33% of engine torque to the front wheels, 67% to the rear, with a multi-disc clutch helping ensure maximum traction.

The S63 Coupe also gets a modified version of the Mercedes Airmatic air suspension system, tweaked with higher camber, a stiffer subframe carrier in the rear and a larger anti-roll bar intended to enhance the 2-door’s agility.

(Mercedes stretches S600 to fill Maybach’s old role. Click Herefor more.)

While Mercedes hasn’t released fuel economy numbers, mileage is expected to improve thanks to such features as the new stop-start system, as well as the overall lighter vehicle weight.

Among the available options are a first-ever set of carbon-ceramic brakes.

A custom AMG 3-spoke steering wheel is one of the unique features in the S63 Coupe.

The AMG model also features a number of aerodynamic enhancements that improve both engine breathing and cooling, as well as high-speed stability.  These include cooling air grilles, a front splitter painted in silver shadow, and a high-gloss black rear air diffuser.

Interior features include a new AMG 3-spoke steering wheel and new aluminum shift paddles. There’s also a unique, high-resolution TFT AMG-style instrument cluster.

(Click Here for all of TheDetroitBureau’s coverage of the 2014 Geneva Motor Show.)

For those who somehow might think the 2015 Mercedes-Benz S63 AMG 4Matic Coupe isn’t quite exclusive enough, the maker is offering a special Edition 1 model that, among other things, features 47 Swarovski crystals in each of the headlights, AMG sport seats upholstered in Designo exclusive Nappa Leather in bengal red/black with contrasting topstitching and piping – and those carbon-ceramic brakes.