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Audi RS6 Avant and Mercedes-AMG E63 S drag race for Top Gear

Sometimes the kids are late for school, and you need a wagon to get them there in a hurry. In its latest drag race, Top Gear finds out which is the quicker high-performance family hauler: the Audi RS6 Avant or the Mercedes-AMG E63 S. The specs suggest this race should be quite close at the finish line. The RS6 has a 4.0-liter twin-turbo V8 with 552 horsepower, but the E63 S is a little more powerful with 577 hp from a 5.5-liter twin-turbo V8. However, the Audi has a traction advantage from the all-wheel drive system, whereas the Mercedes only spins its rear wheels. Pick your favorite, and then watch the video to see if the similar numbers translate to a photo finish in the real world. Related Video:

2015 Mercedes-AMG C63 S First Drive [w/video]

As I mashed the throttle heading into the back straight of a nearly three-mile-long race track, I couldn't help but center my mind on two ostensibly disparate subjects: physics and pistons. If the heart of an automobile is its engine, the heart of the engine are its rotating bits – the crankshaft, pistons and the block they're nested inside. It seems fitting, then, that the internals of the twin-turbocharged 4.0-liter V8 typify the brand-new 2015 Mercedes-AMG C63 sedan I found myself piloting in Portugal. Whereas the last C-Class AMG availed itself of a brute of an engine, employing 6.2 liters of displacement to make its 451 horsepower the old fashioned way, the latest AMG's V8 engine has been downsized radically. I had the opportunity earlier in the day to actually hold the pistons of the new 4.0 Biturbo V8 in my hands, alongside those of the outgoing 6.2. The difference in size is staggering, the new lumps looking downright picayune in comparison to the latter. These eight seemingly diminutive pistons turn combustion into crankshaft-spinning power inside a block that is smaller, lighter and more compact than I'd have thought possible, considering the prodigious output the engine spits out. I had gone into this assignment expecting to pen an ode to lost love; a sonnet of sorrow bemoaning the switch from massive cylinders to wheezing power adders. But I was wrong. In fact, the report that follows may indeed read a little like a love song, except it will heap praise not on what used to be, but instead on what is now possible. The new heart of AMG more than makes up for its reduction in size by relying on turbochargers and smart engineering to turn just 4.0 liters into 469 horsepower and 479 pound-feet of torque starting at just 1,750 rpm, or as much as 503 ponies and 516 lb-ft in uprated S guise. Foot to the floor, eyes focused on the turn ahead, a hard right-hander named Primeira that requires hard braking and quick reflexes, I had a fleeting moment of clarity: These are some hard-working pistons. A few days on the street and track in and around Faro, Portugal, has convinced me that the new Mercedes-AMG C63 is a better car in any meaningful measurement than it was before. And I'll go one step further. Not only is this the best C-Class AMG ever, it's also my new favorite in the hotly contested segment that includes such knee-benders as the BMW M3 and M4.

2015 Mercedes-AMG C63 S Review

"It's about great cars on great roads." The late David E. Davis, Jr., said this of Winding Road when he took the reins as editor-in-chief in 2006. Our mission at that magazine was to not just review cars, but to describe the emotional experience of piloting brilliant machines down beautiful roads. "The art of driving," per David E. This all comes flooding back into my mind as I pull out of a Shell station onto Angeles Crest Highway, just south of the 210 freeway in La Canada Flintridge, CA. I'm in the 2015 Mercedes-AMG C63 S. I've got a full tank of fuel, the whole day to myself, and I'm staring down one of the finest driving roads in the country. Prior to this moment, I spent two days bombing around the greater Los Angeles area in this sinister-looking C63 S. This car is a villain, and looks appropriately so in black paint with the $750 AMG Exterior Night Styling pack. The C-Class as a whole is far more upscale in this latest generation, with its long hood, cab-rearward design, and short rear deck. "Baby S-Class" is not an exaggeration. Thankfully, the addition of AMG bits don't detract from the new C's more premium aura. Where a BMW M3 just looks like a brash 3 Series, the C63 is more like a C400 with a trick up its sleeve. The 4.0-liter V8 is an exceptional engine. Start the engine, and there's no question you're blessed with the power of AMG. Any worries I had about the new, twin-turbocharged, 4.0-liter V8 not providing enough aural delight are gone, especially with the $1,250 AMG Performance Exhaust. At start-up there's a low, burbly sound quality, typical of a V8. At full throttle, it's loud, angry, and passionate. I will always miss the naturally aspirated, 6.2-liter M156 V8 from the last C63, not only for its noise, but for its character. That said, I eagerly welcome Mercedes' new turbocharged techniques. The 4.0-liter V8 is an exceptional engine. In C63 S guise, the M178 lump makes 503 horsepower and 516 pound-feet of torque, the latter of which comes on in full force as low as 1,750 rpm. That's a ton of power for the 3,935-pound C63. But it never feels like there's too much to handle. Power comes on progressively, and when I mash the throttle on a straight stretch of pavement, the car is composed and controlled. And quick. Seriously quick. Zero-to-sixty-in-under-four-seconds quick. The balance between viciousness and grace is perfectly met in this new C63.