1972 Dodge Challenger 340 Four Barrel on 2040-cars

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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.

Indications of 825 hp and emissions issues for Hellcat called 'speculation' by Chrysler

The 2015 Dodge Challenger SRT Hellcat is probably one of the hottest cars of the moment mostly because of its insane, 707-horsepower supercharged V8. However, there are conflicting reports coming out that the powerplant might be having problems with its emissions compliance and may be capable of even more power.
Jalopnik says that an unnamed source within Fiat Chrysler Automobiles told it that the Hellcat was having problems meeting emissions standards at its 707-horsepower tune. The person claimed that the automaker has been testing the V8 with different types of sensors, possibly to make it a bit cleaner in the future. Autoblog spoke to SRT spokesperson Dan Reid, and he said about the claimed poor emissions, "It's totally speculation."
The source also claimed that the Hellcat had been dynoed at a monumental 825 horsepower, internally. Based on the other rumor, though, it's hard to imagine the engine being emissions compliant like that. Autoblog also asked Reid about this speculation about more power and was told, "They are totally speculating about that."

An inside look at Mopar's SEMA fleet

Mopar is heading to the SEMA show in Las Vegas with a fleet of customized vehicles that appeal to enthusiasts of all stripes. There's a Dodge Viper ACR concept that follows in the lineage of the supercar's great road racing past, and a custom Ram ProMaster that might just be the ultimate outdoor party machine.
We got an inside look at Mopar's cars that will be on display at the show, which also include a Dodge Challenger T/A concept, two crazy Jeeps and a Ram 2500 Outdoorsman that could change the way you camp. While these are some of our favorites, Mopar is bringing plenty to SEMA, so let us know your top choices in the comments section.