1992 Jaguar Xjs Base Convertible 2-door 5.3l on 2040-cars

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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.

2014 Jaguar XFR-S is the power and the fury

If there's something wrong about a sedan with a 550-horsepower supercharged V8, we don't want to hear about it. Instead, we want to marvel at the car in person, which is fortuitous because Jaguar has officially unveiled the 2014 XFR-S at the 2012 LA Auto Show. That blown 5.0-liter V8 dishes up a full 502 pound-feet of torque, which is good enough to shuttle the four-door to 60 mph in a scant 4.4 seconds. And, thanks to a start stop system and a few other fuel-saving tricks, the 2014 XFR-S gets away without being hit by the gas guzzler tax.
That's all good news, but we're just as excited about the fact that engineers managed to crank up the vehicle's chassis stiffness by a ludicrous 30 percent. Stiffer dampers and springs also give the car a little more poise, and a wide-open exhaust lets the whole world know you're kicking down their door. You know, in case the electric blue paint and wild body work didn't tip your hand. Check out the full gallery above for a closer look.

2014 Jaguar F-Type, Project 7 Concept snarl in Jay Leno's Garage

Jay Leno gets to drive a lot of nice cars, and the Jaguar F-Type V8 S he pilots in the latest episode of Jay Leno's Garage is no exception. Eric Johnson, vice president of Jaguar Western Region brought the car to Leno's garage, which impresses the comedian with its 5.0-liter V8 that makes 495 horsepower, 460 pound-feet of torque and a muscle car-like roar.
But there's a surprise this episode: Leno secured a drive in the Project 7 Concept at Pebble Beach this year, and the experience was caught on video. Based on the F-Type, the Project 7 is a functional concept car that nods to Jaguar's seven wins at Le Mans and features bespoke styling cues, a special exhaust system and, perhaps most importantly, 50 more horsepower from the supercharged V8.
Watch the latest episode of Jay Leno's Garage in the video below. You'll need a little over 23 minutes to see the whole thing.