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Hennessey has a proud history of tuning high-performance machinery from General Motors and taxing it out onto Grand Parkway, a new stretch of toll road on the outskirts of Houston, Texas. That's what it did with the Cadillac CTS-V, spooling its twin turbochargers until it cracked 220 miles per hour. It did the same with the Corvette Stingray, feeding it nitrous all the way up to 200 mph. Now it's time for the new Chevy SS.

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The McLaren MP4-12C is the latest project from Hennessey Performance Engineering, and the folks tweaking the British supercar's twin-turbocharged V8 have given it 704 horsepower through an engine management software upgrade, intercooler upgrade, new stainless steel exhaust system and dual air induction filters.

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Hennessey Performance – that purveyor of things silly-powerful – has announced a sequel to its bonkers Lotus-based Venom GT, the appropriately sequential Venom GT2. While the performance company isn't quite ready to release full technical details about the new car, it has supplied us with a few of the vitals, as well as a gallery's worth of first-look eye-candy.

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There's gilding the lily, and then there is this: An open-air version of Hennessey's 1,200-horsepower Venom GT supercar.

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What do John Entwistle, Rutherford B. Hayes, Hugh Jackman and Hennessey Performance Engineering all have in common? Very little, we imagine, outside of celebrating October birthdays.

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It's easy to talk endlessly about unbelievably powerful cars, almost to the point that numbers become meaningless. In an effort to crystallize what 1,200 horses in a 2,685-pound car can do in the real world, we present a new video of the 2012 Hennessey Venom GT.

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Hennessey Venom GT clears its throat – Click above to watch the video after the break

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2011 Hennessey V700 Coupe on the dragstrip – Click above to watch video after the jump

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Hennessey Venom GT – Click above for high-res image gallery

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2010 Hennessey V700 - Click above for high-res image gallery

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Hennessey Hyundai Genesis Carbon Coupe - Click above for high-res image

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2010 Hennessey Z700 – Click above for high-res images

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Click above to enlarge the Henessey HPE700 Camaro

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