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2015 Dodge Viper getting small increase in power

The Viper is used to being the most powerful car in the Dodge and SRT stables, but the arrival of the 2015 Dodge Challenger SRT Hellcat means that's no longer the case. The serpentine supercar is, however, reportedly getting a small boost in output for 2015, amounting to all of five horsepower.
The increase was uncovered by Road & Track courtesy of the SAE J1349 certification process to which Detroit's Big Three automakers submit themselves and which reports the Viper's output at 645 hp instead of the 640 it was rated at until now. There are a hundred factors that could have contributed to the relatively mild boost in output (best guess? nothing at all changed...), but we doubt anyone's going to complain about some extra horses under the hood.
The five-horsepower boost brings the Viper that much closer to the 650-hp Chevy Corvette Z06, not to mention the 707-hp Hellcat, but the Viper's impressive power-to-weight ratio ought to mean it'll have little problem keeping up in a straight line - which is just one of the reasons why Chrysler won't shoe-horn the Hellcat into the Viper: as R&T points out, the supercharged engine is too heavy and the blower makes it too tall to fit in the Viper's engine bay.

Dodge Challenger spied exercising supercharged Hellcat Hemi V8

One of the prime complaints against the Dodge Challenger is that, even in SRT8 guise, its 470 horsepower is responsible for hauling over 4,200 pounds of vehicle. For comparison, the 420 hp in the Ford Mustang GT only has to deal with 3,618 lbs. Things only get worse from there, as the higher-performance variants of both the Mustang and the Chevrolet Camaro are far more powerful than an SRT8 without adding on much heft.
So what is Chrysler to do? The correct answer is add a whole lot more grunt to its hefty two-door and even the odds. That's where the all-new Hellcat engine comes into play. We reported on this engine in May, and suggested that the Hellcat, a supercharged powerplant based on a 6.4-liter V8, would easily generate 500 to 570 hp and could likely arrive boasting more than 600 ponies.
Chrysler's ace in its sleeve has now been spied testing, with a number of Hellcat-equipped Challengers running the potent new engine both in more urbanized areas and under the sun of Death Valley. The hoods on these testers have been raised to accommodate the engine, and that camouflage over the fascias of these prototypes is there to hide a larger air intake. We also note what appears to be a new split grille under wraps. As for power output, our spies are now suggesting a Viper-equalling 640 hp from the Hellcat-equipped cars.

Dodge Charger Hellcat hitting 60 in 2.9 seconds on drag radials?

The Dodge boys and their cousins from SRT have shoehorned the same 707-horsepower, 6.2-liter supercharged V8 into both the Dodge Challenger and Charger. The former being a two-door, it's lighter than the latter four-door sedan. So it would stand to reason that the Dodge Challenger SRT Hellcat would be the quicker of the two, right?
Only that's not necessarily proving to be the case. On stock rubber, yes, the coupe beats the sedan: Dodge quotes a 0-60 time of 3.7 seconds for the Charger SRT Hellcat and 3.5 for the Challenger. Same gap across the quarter-mile: 11 seconds flat for the Charger versus 10.8 seconds for the Challenger. But according to recent reports, the story changes when you put both on drag radials.
While visiting Chrysler HQ in Auburn Hills, MI, TorqueNews.com caught wind of performance figures for the Charger Hellcat on drag tires: 0-60 in a mind-blowing 2.9 seconds and a quarter-mile in just 10.7. The latter figure just barely pips the Hellcat-powered Challenger's NHRA-certified figure of 10.8, making the Charger not only the fastest sedan on the market, but also the fastest muscle car. What isn't immediately clear, however, is whether the drag radials in question have any tread on them and are street-legal, or if they're pure slicks confined to a closed strip.