Hennessey has announced another tuned version of the ZR1 to fill what it feels is a gap in the Corvette range.

The inspiration, according to the press release, is that ‘Porsche owners can order the GT3 RS and Dodge Viper enthusiasts wanting the ultimate road race Viper have the ACR’ but there’s no ultra-hardcore, lightweight version of the ‘Vette.

Well, Hennessey reckon its solved that problem with the Z700 package for the ZR1.

As usual, there’s a big power hike, which comes from an upgraded supercharger, exhaust and air induction system, increasing output from 638bhp to a ‘dyno-tuned’ 705bhp and dropping the 0-60mph time below three

seconds. But, HPE has also spent time ‘track focussing’ the ZR1 with a set of Michelin Pilot Sport Cup tyres wrapped around lightweight carbon fibre wheels, saving almost 30kg of rotating mass, while a new carbon fibre splitter, canards and rear spoiler generate 300lbs of downforce. The interior gets a pair of lightweight carbon fibre seats and an alcantara steering wheel and shift knob.

HPE plans to take its version of the ZR1 to the ‘Ring for an assault on the factory ZR1’s time of 7:26.4 later this year and, for a few extra quid, will even deliver your new Z700 directly to the Nordschleife and offer driving instruction around the Green Hell.

Two upgrade packages are available for people who actually take Hennessey’s ‘too much power is never enough’ mantra seriously, with 750bhp and 1000bhp, respectively.

Just 24 examples will be built in 2010 at a cost of $207,150 each, including the donor car.