2008 Audi S4 Sedan 4-door 4.2l V8 B7 Sunroof on 2040-cars

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Xcar weighs in on the five best-sounding modern cars

Getting behind the wheel of a well-balanced vehicle can be a wonderfully visceral experience, thanks to the combined feeling of things like the weight of the steering, the bite of the brakes, and, of course, the roar of the engine. Unfortunately, many of the sensations of driving require actually being in the driver's seat to understand them, but thankfully the intoxicating noise of a beautifully tuned internal combustion engine can be shared with everyone. In a new video, Xcar shares their opinion on the five best-sounding modern performance cars. The list is a symphony of horsepower. As opposed to keeping all of the vehicles brand new, Xcar actually picks a few that are recently off the market. They're all definitely champs, though. While the list itself is well stocked, you might be able to argue with the specific order, and it would be nice to hear a few participants from outside of Europe for a collection like this one, too. No matter. Every listener is sure to find something they like in the bunch, though. Turn up the volume and enjoy.

Audi to launch 600-hp RS6 Avant Plus?

Much to the dismay of many - but apparently not enough - there's a whole category of power wagons available overseas that we just can't get our hands on. While the Mercedes-Benz E63 AMG Estate and Cadillac CTS-V Sport Wagon are both available Stateside, the recently revised Mercedes-Benz CLS63 AMG Shooting Brake, the Jaguar XFR-S Sportbrake we recently drove at the Nürburgring and the Audi RS6 Avant remain out of reach for American buyers. They all stand on more-or-less equal footing, with forced-induction V8s producing around 550 horsepower. But Audi is apparently taking things over and above with a new RS6 Plus.
Revealed ahead of schedule on a British dealer's website (which leaked details accompanied by a stock photo of the existing model), the RS6 Avant Plus will apparently keep the same 4.0-liter twin-turbo V8, but upgrade from 560 hp to a nice, round 600 to put it ahead of the competition and in league with supercars. Considering that the existing RS6 Avant is already capable of cracking the four-second barrier to 60 and tops out at over 190 miles per hour, we're sure the Plus version will positively annihilate the Autobahn, all while bringing your whole family along for the ride.
Unfortunately it doesn't look any more likely that Quattro GmbH's latest Plus model will make the transatlantic journey to American showrooms, but we can hope that maybe Audi will perform similar modifications on the RS7 Sportback we do get here.

Audi A7 Sportback H-Tron Quattro packs plug-in hydrogen powertrain

If you think a plug-in diesel hybrid is an expensive proposition, just wait until you hear details about the just-revealed Audi A7 Sportback H-Tron Quattro. The "H" in H-Tron, as you might guess, stands for hydrogen, so say hello to a new concept that combines a plug-in battery system with a hydrogen fuel cell. Yeah, exactly. Let's start with the numbers. On the plug-in side, the new H-Tron has an 8.8-kWh lithium-ion battery that can power the car for up to 31 miles on battery power. With electric motors on both axles – it's a Quattro, after all, but a through-the-road hybrid with electronic torque distribution management – the A7 H-Tron uses a hydrogen fuel cell and four (!) H2 tanks to offer about 62 miles per gallon equivalent. Audi says the overall fuel cell stack efficiency is "as high as 60 percent" while the electric motors operate at 95 percent efficiency. Efficiently turning all of that electricity into movement means the A7 Sportback H-Tron Quattro has a total power output of 398.3 pound-feet of torque. The 4,299-pound concept can allegedly go from 0-62 miles per hour in 7.9 seconds and has a top speed of 112 mph. The car's total range is 311 miles. The A7 H-Tron is not the first plug-in hydrogen vehicle concept. That title goes to the Ford HySeries Edge. Mazda also considered putting a hydrogen range extender in the Mazda5 plug-in van. The Audi A7 Sportback h-tron quattro It sprints from 0 to 100 km/h (62.1 mi) in 7.9 seconds and on to a top speed of 180 km/h (111.8 mph). It covers over 500 kilometers (310.7 mi) on one tank of fuel – and its exhaust emits nothing more than a few drops of water: The A7 Sportback h-tron quattro, which Audi is unveiling at the Los Angeles Auto Show 2014, uses a powerful, sporty electric drive with a fuel cell as its energy source that operates in combination with a hybrid battery and an additional electric motor in the rear. The overall electrical system power of 170 kW is transferred to both the front and the rear wheels. This drive configuration makes the emission-free Audi A7 Sportback* a quattro through and through – a new departure in fuel cell cars. "The A7 Sportback h-tron quattro is a genuine Audi – at once sporty and efficient. Conceived as an e-quattro, its two electric motors drive all four wheels," explained Prof. Dr. Ulrich Hackenberg, Member of the Board of Management for Technical Development at Audi. "The h-tron concept car shows that we have mastered fuel cell technology.