1982 Ford Mustang Gt Hatchback 2-door 255 Ci. V8 on 2040-cars

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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 Shelby GT bows in Scottsdale with 627 supercharged ponies

Between the base V6, the EcoBoost turbo four, the eight-cylinder GT, the monstrous GT350 and the new GT350R (to say nothing of transmission and convertible options), muscle-car enthusiasts have a staggering array of Mustangs to choose from. And now there's one more as Shelby American has introduced the new 2015 Shelby GT. Building off the success of the 2007 Shelby GT and the 2013 follow-up, the new 2015 model was just introduced at the Ford booth at Barrett-Jackson in Scottsdale, AZ. It's based on the latest Mustang GT (whether factory fresh or commissioned from an owner's existing pony car) but upgrades with an enviable list of enhancements from Ford Racing Performance Parts, Shelby's own upgrades and top-shelf third-party components. For starters, the engine is supercharged up to 627 horsepower (with over 700 available through further upgrades). It's got 3.73 gears, a Borla exhaust, WELD Racing wheels, Michelin tires and Wilwood six-piston front brakes. Visual enhancements include a carbon-fiber body-kit (including a two-piece rear diffuser) and billet aluminum front grilles. Designed from the get-go to be sold around the world, the 2015 Shelby GT is certified for use in all 50 states and comes with a Shelby American CSM number registered in the company's registry, but all those enhancements don't come cheap: Shelby's charging $39,995 for the new GT, and that's just for the modifications. Add that to the $32k sticker on a Mustang GT donor and you're looking at over $70k – which is not only more than Ford itself is expected to charge for its own GT350, but more than Dodge gets for a Challenger Hellcat. Related Video: SHELBY AMERICAN LAUNCHES 2015 SHELBY GT MUSCLE CAR FOR ENTHUSIASTS WORLDWIDE LAS VEGAS – Jan. 16, 2015 – Shelby American, a wholly owned subsidiary of Carroll Shelby International Inc. (CSBI:PK), launched the first global Shelby GT muscle car, which is based on the all-new 2015 Ford Mustang GT. One of the most popular cars in Shelby history the 627 HP 2015 Shelby GT was unveiled today at the Barrett-Jackson Scottsdale Auction in Ford Motor Company's booth. Shelby is now taking orders with delivery of cars planned for the beginning of the second quarter of 2015.

Forza Motorsport 6 shows off the Ford GT's active rear spoiler

We knew that among the many technical treats provided by the Ford GT is an active rear wing, and we knew that the domestic exotic is going to grace the cover of Forza Motorsport 6. What we didn't know is how that rear wing looked when deployed, and thanks to Forza, now we do. If the driving game is being its usual model of accuracy, then the GT wing is no joke - everyone will know when you mean business. We've seen this kind of setup on the Bugatti Veyron and, more subtly, on the McLaren P1. Like those two examples, the GT flap automatically changes its angle in different conditions, such as under braking. When Ford gave us a tour of the GT interior we noticed a lot of buttons, now we're wondering if any of them allow the driver to deploy the wing at will. There is a button marked "aero," but no associated graphic to explain what it's for. The AR12 Gaming host of the video above isn't there for the GT, though - he's responding to audience requests for 60-frames-per-second gameplay footage in Forza, and to see how the tire smoke looks while drifting. But his stop-and-go drifting efforts give us plenty of footage of the wing in action, so check it out.