2000 Dodge Viper Gts on 2040-cars

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Cold start comparison: 2020 Alfa Romeo Giulia Quadrifoglio vs. 2013 Dodge Challenger SRT8

The 2020 Alfa Romeo Giulia Quadrifoglio is a five-seat, compact luxury sport sedan packing 505 horsepower thanks to a 2.9-liter twin-turbocharged V6. My personal 2013 Dodge Challenger SRT8 392 is ... well ... not. It's a full-sized muscle coupe whose iron-block 6.4-liter V8 makes 470 hp in the very traditional way: it's freakin' huge, like everything else about the car.  On paper, these two have nothing in common beyond the fact that they were built by the same multi-national manufacturing entity.  But if paper were the be-all and end-all of automotive rankings, everybody would buy the same car. And we don't, especially as enthusiasts. Whether it's looks or tuning or vague "intangibles" or something as simple as the way a car sounds, we often put a priority on the things that trigger our emotions rather than setting out to simply buy whatever the "best" car is at that particular moment.  So, what do these two have in common? They both sound really, really good. Like looks, sounds are subjective. While a rubric most assuredly exists in the world of marketing (attraction is as much a science as any other human response), we have no way of objectively scoring the beauty of either of these cars, and the same applies to the qualities of the sound waves being emitted through their tail pipes.  But we can measure how loud they are. In fact, there's even an app for that. Dozens, as it turns out. So, I picked one at random that recorded peak loudness levels, and set off to conduct an entirely pointless and only vaguely scientific experiment with the two cars that happened to be in my garage at the same time.  For the test, I opened up a window and cracked the garage door (so as not to inflict carbon monoxide poisoning upon myself in the name of discovery), and then placed my phone on a tripod behind the center of each car's trunk lid. I fired each one up and let the app do the rest. I then placed my GoPro on top of the trunk for each test so that I could review the video afterward for any anomalies.  I started with the Challenger. The 6.4-liter Hemi under the hood of this big coupe is essentially the same lump found under the hood of quite a few Ram pickups, and it has the accessories to prove it. Its starter is loud and distinctive. Almost as loud, it turns out, as the exhaust itself. As its loud pew-pew faded behind the V8's barking cold start, we recorded a peak of 83.7 decibels. In the app's judgment, that's roughly the equivalent of a busy street.

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.

2019 Dodge Challenger SRT Hellcat Redeye is the Demon spawn

The Demon has passed from us, but the Demon's spawn are here, so please allow them to introduce themselves. A new demi-Demon trim level has been anointed as the 2019 Dodge Challenger SRT Hellcat Redeye. Plus there's an updated Challenger SRT Hellcat and new Challenger R/T Scat Pack Widebody. Like with the Charger introduced this morning, they have inherited some of the best parts from the Demon. The Hellcat Redeye is possessed by the Demon's howling supercharged 6.2-liter Hemi, making 797 horsepower and 707 pound-feet of torque. Dodge proclaims it the "most powerful production V8" and "quickest production muscle car," with a 0-60 time of 3.4 seconds and quarter-mile time of 10.8 seconds at 131 mph. Top speed: 203 mph. Dodge can claim these superlatives, of course, because the 840-horsepower Demon's limited production run has ended. The Hellcat Redeye's Hemi is paired with an eight-speed automatic. Dodge says the powerplant gets 25 major component upgrades, including a larger supercharger (2.7 liters, up from 2.4) with higher boost pressure (14.5 psi, up from 11.6), strengthened connecting rods, pistons and valve train, high-capacity fuel injection system and improved lubrication. It gets a second fuel pump and a higher redline of 6,500 rpm. Theoretically, if you were someplace where you could operate at full throttle without letting up, Dodge says the Hemi would drain the fuel tank in under 11 minutes. Yet the car gets a 22 mpg highway rating from the EPA. View 30 Photos It also has the Torque Reserve system that starts building boost before launching, as well as the air conditioned intercooler to provide extra cool intake air. Both of these were features in the Demon. Furthermore, if the standard 2.62:1 final ratio isn't quick enough for you, Dodge offers a 3.09:1 rear axle. The Challenger SRT Hellcat Redeye also comes with the Demon and Hellcat Widebody's fat fender flares. It's an unsurprising inclusion, since you'll want as much tire as possible for all that power. Now, a mere clear-eyed Challenger SRT Hellcat gets a 10-horse boost for 2019 to 717 horsepower, and a smidge more torque at 656 pound feet. A six-speed manual transmission is standard, and an eight-speed automatic is an option. Both Hellcat models get the new dual-snorkel hood we've seen in spy shots. It's meant to evoke 1970s Dodge muscle cars. Dodge says the airflow from the hood alone reduces engine temperature by 4 degrees Fahrenheit.