2003 Porsche Boxster Roadster S Convertible 2-door 3.2l on 2040-cars

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Mercedes-AMG GT vs. Porsche 911 [w/poll]

Mercedes-Benz designed the AMG GT to compete head-on with the Porsche 911. It's a clear, singular purpose, and Benz brings a lot of money, technology and race-bred expertise to the fight.
The AMG GT is Merc's followup to the awesome SLS AMG, the retro-modern, gullwing-doored coupe that took us by storm half a decade ago. But this new GT coupe is a more focused sports car than the SLS, rather than an all out supercar capable of extreme performance. It's got a brand-new V8 engine, and state-of-the-art technology that help it to not only be a proper Mercedes, but to be a serious performer.
Mercedes will sell its new baby in two models. The GT S arrives first, in spring 2015, followed by the standard GT in mid-2016. Of course, there's room to grow from there. And while Porsche may have already expanded its 911 range to include a vast variety of models, here's how Stuttgart's icon stacks up against Affalterbach's bad boy.

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).

'We're not a hedge fund': Porsche plans to curtail speculators and flippers

A sizable number of speculators view cars as an investment. Rare or unusual models are quickly snapped up and either parked for years or flipped for a profit. Cars from automakers like Porsche and Ferrari are more prone than others, and at least some people behind these models are getting a bit tired of it. While it's difficult to police what goes on after you sell a car, Porsche has some plans that might curtail the problem before it starts. Andreas Preuninger, the head of GT road-car development and the man behind the new 911 GT3, spoke to Car and Driver at a recent event. "I personally like to see my cars being used," he said. "That's what we build them for. They are just too good to be left to stand and collect dust." One recent example of this rampant speculation is the 911 R. While the special manual-only model sold for $185,950 when new, used versions were selling for nearly $1.3 million just months after it went on sale. While the car is a masterpiece and an instant classic, a good number will be parked and simply used as art and not the rolling testaments to the man/machine interface they were intended to be. The concern over valuations has become so fierce that some owners are upset that Porsche is offering the new 911 GT3 with a manual transmission, fearing that it may hurt the value of the 911 R. "When I said we're not a hedge fund, I'm talking to those people who are yelling at us for offering the manual transmission similar to the R," Preuninger said. "But if there are people wanting to buy cars like that, then as a company we should try to fulfill that, to meet that demand." It seems Porsche is keeping a close eye on who is flipping cars. Since there is often far more demand than supply with certain models, the German automaker has a name for every car before it's built. Buyers with bad reputations might not even make the wait list. Related Video: