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SRT Viper dukes it out with Mercedes SLS Black Series in new Head 2 Head

In Episode 36 of Motor Trend's Head 2 Head, now that the Corvette ZR1 is no more, Jonny Lieberman has to look overseas to the Mercedes-Benz SLS AMG Black Series for a challenger with similar philosophy to the SRT Viper: long hood hiding a high-horsepower engine set way back, rear-wheel drive, tiny trunks. That puts the Viper's 8.4-liter V10 with 640 horsepower and 600 pound-feet of torque against the SLS AMG's 6.2-liter V8 with 622 hp and 468 lb-ft.
However, the congruences in philosophy and magnitude of numbers doesn't translate to the driving experiences of the two, which are literally and figuratively on different continents. Lieberman gets a handle on the two of them on Northern California roads, Randy Probst then finds out how, and how quickly, they can lap Laguna Seca.
They both get kudos for being improvements on their original sources, but only one of them can take the win. You can find out by watching the video below.

Ecclestone wonders if F1's upcoming turbo V6s should get augmented sound [w/videos]

While every team on the Formula One grid is worried about making a good showing in this year's championship at the same time as they develop a brand-new car for next year's championship, Bernie Ecclestone and F1 circuit promoters have a different concern: how next year's cars will sound. The current cars use 2.4-liter, naturally-aspirated V8s that can reach 18,000 revolutions per minute and employ dual exhaust, next year's engine formula calls for 1.4-liter turbocharged V6s that are capped at 15,000 rpm and are constrained to a single exhaust outlet. Ecclestone and promoters like Ron Walker believe the new engines sound like lawnmowers and that the less thrilling audio will keep people from coming to races. If Walker's Australian Grand Prix really is shelling out almost $57 million to hold the race, every ticket counts. As a fix, according to a report in Autoweek, Ecclestone "suggests that the only way to guarantee [a good sound] may be to artificially adjust the tone of the V6s."
However, neither the manufacturers nor the governing body of F1, the FIA, think there will be a problem. Ecclestone fears that if the manufacturers "don't get it right" they'll simply leave the sport, but the only three carmakers and engine builders left next year, Renault (its 2014 "power unit" is pictured), Mercedes-Benz and Ferrari are so embedded that it would stretch belief to think they'd leave the table over an audio hiccup - if said hiccup even occurs. And frankly, these issues always precede changes to engine formulas, as they did when the formula switched from V10 to V8; fans, though, are probably less focused on the engines and more on the mandated standardization of the sport and the spec-series overtones that have come with it.
No one knows yet what next year's engines will sound like, but we've assembled a few videos below to help us all start guessing. The first is an engine check on an Eighties-era John Player Special Renault with a 1.5-liter V6 turbo, after that is Ayrton Senna qualifying in 1986 in the Lotus 98T that also had a 1.5-liter V6 turbo, then you'll find a short with a manufactured range of potential V6 engine notes, and then the sound of turbocharged V6 Indycars testing last year at the Indianapolis Motor Speedway. Any, or none of them, could be Formula One's future.

Mercedes-Benz A45 AMG is Affalterbach's first big leap into the little pond

The recent history of AMG is turning out amped-up versions of Mercedes-Benz offerings that would hardly ever be mistaken for their sedate counterparts. Sure, you'd need to pay attention to pick a G-Class from the G63 AMG, but dual side-pipes are a quick giveaway. The Mercedes-Benz A45 AMG is not only a new era in Affalterbach's attention on smaller cars, it is probably also the most subtle transformation we can think of in the line-up.
Low and chunky enough in standard guise to make a sporting impression, the aesthetic makeover is confined to black trim around the lower rim of the hatch, black wheels with red brake calipers and a single, rectangular exhaust tip on either side of the diffuser. It's easier to make a positive ID inside, where the flat-bottomed steering wheel, red seatbelts and red-rimmed details say, "You know what I am..."
If the car is running, though, it won't take but a second. The 2.0-liter turbo spitting 360 horsepower and 332 pound-feet will grumble through a sport exhaust at idle, and bellow through the same on it's way to a 0-60 time of less than 4.5 seconds. And if you need something that looks a little harder - and you want those quad pipes - then the A45 AMG Edition 1 is the treasure you seek. There's a press release below for all the info you'll need until the hot hatch goes on sale in Germany later this year, and photos for the rest of us while we wait to find out if we'll get a chance to buy it.