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This classic Jaguar XJ has a 720-hp ungentlemanly secret

Forget Tawny Kitaen. If you want to make a Jaguar XJ rock, just do what this guy did: stuff a heavily modified and turbocharged General Motors V8 under the hood, and take it to the track.
The video calls this Series 1 XJ a sleeper, but with its open exhaust and obvious turbo whistle, the once-gentlemanly sedan is anything but. The owner says that the engine is GM LQ9 V8 that has been stroked to 402 cubic inches putting out around 720 horsepower with 12 pounds of boost (in standard form, this 6.0-liter V8 was used in the second-gen Cadillac Escalade). Check out the video below to see what that kind of power does for this classic Jaguar in the eighth-mile.

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).

Jaguar F-Type gets even more British with Design Edition

Short of maybe driving a Morgan while wearing tweed and smoking a pipe, automobiles don't come much more quintessentially British than a Jaguar. But now the F-Type is going to be even more so with the launch of the new British Design Edition. It's based on the six-cylinder F-Type S, but upgrades with a series of special touches to set it apart. Red, white, and blue are the dominant colors from which buyers will be able to choose both the exterior color and that of the interior contrast stitching. The leather interior comes in black, and those less patriotically inclined can spec the outside to match. The British Design Edition also features 20-inch wheels in dark gray satin finish, packing upgraded brakes with red calipers. The Design package comes standard with upgraded aero, as does the 12-speaker Meridian sound system. And naturally there are special insignia inside and out. Buyers will be able to choose between coupe or convertible and rear- or all-wheel drive, but either way motivation comes in the form of JLR's 3.0-liter supercharged V6, driving 380 horsepower and 339 pound-feet of torque through an eight-speed automatic transmission. Only 300 units will be coming to the United States, with prices starting at $92,100 (plus a $995 destination charge) – representing a substantial $14.8k premium over the $77,300 price of entry for an F-Type S Coupe. Spec one out with similar options and you'd be looking at $86,250, which makes the privilege (and resale value) of acquiring the limited edition a $5,850 proposition. Any way you cut it, though, the elbow patches cost extra.