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Top horsepower-per-dollar cars in 2017

Bang for the buck. That quasi-scientific statistic is bandied about by motor heads everywhere from classrooms to barrooms, though the truth of the matter is that it's exceedingly complex to measure. A fair performance-per-dollar index would include something like cross-referencing MSRP (Manufacturers Suggested Retail Price) with point-to-point times on a track or driving route, which is obviously hard to do comprehensively. But, for the sheer joy of talking about cars and playing with a big spreadsheet, there's always the horsepower-per-dollar index, which is more straightforward, albeit hilariously flawed. There are vagaries even with this simple formula, of course: MSRP for vehicles can change at a moment's notice, to say nothing of the bottom-line shifting that happens with local deals or showroom negotiation. For this list we're running with the straight MSRP wherever possible, and as recently reported as we can get it. All the vehicles on this list are 2017 models, and all trims are reported where the lowest price and differing power levels intersect. Some choices were made for personal preference and some for sanity, avoiding things like all 48 trim levels of the Ford Transit, all with the same horsepower). If this list were a simple top ten, or even a top fifty, you'd be bored to tears with all the red, white and blue that is represented. Following perfectly with conventional wisdom, American cars really do lead the world where hp/$ is concerned. So, for the sake of variety (and the sheer joy of seeing a minivan 'win' one round of this thing) I've sorted out some top five and bottom five lists for broad power categories. Let's dive in. Less Than 100 Horsepower Okay, okay, this is hardly a category we'll grant you. But we've often tried to click off all the sub-100-hp cars on sale in the US, and making this list gave us an excuse. It also illustrates that none of these smallish vehicles bring cheap horsepower to the table - for that you'll need a motorcycle. The segment-leading Chevy Spark (above) asks just over $139 for each hp, and that Smart Fortwo Electric Drive has hp on sale for about the same price as its very distant family cousin, the Mercedes-Benz SL65 AMG (insert your favorite Smart joke here... we know you want to).

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.

FCA adds 88k Dodge Challengers to Takata inflator recall

The Takata airbag inflator recall from FCA US is growing 88,346 vehicles larger in the US after the company's discovery of the faulty parts in the 2008-2010 Dodge Challenger. The affected examples have production dates between September 19, 2007, and October 29, 2010, and the coupes need the replacement components on the driver's side. According to chronology posted by the National Highway Traffic Safety Administration (as a PDF), the automaker was auditing the models covered under the campaign in July and "identified a population of vehicles that was inadvertently excluded." Initially, FCA believed these cars were using an unrecalled Takata inflator. The audit revealed that the affected cars indeed used a recalled version. As with the rest of the faulty parts, exposure to moisture can cause them to ignite too quickly during an airbag deployment and spray shrapnel at occupants. The problem has been linked to at least eight deaths worldwide and a vehicle fire in Japan. The Challenger wasn't previously part of FCA's 3.3-million unit national campaign or the subsequent expansion. According to FCA US the parts to complete the repairs in these Challengers aren't currently available. However, owners will be notified of the issue by mail starting August 14. They will receive a second notice when the parts become available. Related Video: RECALL Subject : Driver Side Frontal Air Bag Inflator May Rupture Report Receipt Date: JUL 10, 2015 NHTSA Campaign Number: 15V444000 Component(s): AIR BAGS Potential Number of Units Affected: 88,346 All Products Associated with this Recall Vehicle Make Model Model Year(s) DODGE CHALLENGER 2008-2010 Details Manufacturer: Chrysler (FCA US LLC) SUMMARY: Chrysler (FCA US LLC) is recalling certain model year 2008-2010 Dodge Challenger vehicles manufactured September 19, 2007, to October 29, 2010. The affected vehicles are equipped with a dual-stage driver frontal air bag that may be susceptible to moisture intrusion which, over time, could cause the inflator to rupture. CONSEQUENCE: In the event of a crash necessitating deployment of the driver's frontal air bag, the inflator could rupture with metal fragments striking the driver or other occupants resulting in serious injury or death. REMEDY: Chrysler will notify owners, and dealers will replace the driver's frontal air bag inflator, free of charge. Parts to remedy the vehicles are not currently available. Interim notices will be mailed to owners beginning August 14, 2015.