total only about 250 were made. The 250 were optioned the same but did not have the carbon hood. In 2012 and 2013, these options could be ordered through the Z07 package on the Z06. ZR1 The ZR1 is the high performance variant of the Z06 and was first reported by several print and online publications, based on rumors that General Motors was developing a production version of the Corvette above the Z06 level under the internal code name Blue Devil (named after CEO Rick Wagoner's alma mater, Duke University). The car was originally rumored to feature a supercharged LS9 engine having a power output of more than . The October 12, 2006 issue of AutoWeek published photos by photographer Chris Doane of a C6 Z06 with special auto-manufacturer-issued license plates with a hood bulge, widely thought to confirm the presence of a supercharger on the Blue Devil. Other names attached to the project included Corvette SS, after the late '50 racing car, and Corvette Z07. In February 2007, a worker at a Michigan shipping company posted pictures online of a powertrain development mule that was being shipped to Germany, believed to be part of the Blue Devil program. The car had manufacturer's license plates, carbon-ceramic disc brakes, enlarged fender vents, a hood bulge, and an engine with a positive-displacement supercharger in the valley between the cylinder banks and a water-to-air intercooler atop it. GM began to release details on the Blue Devil project in April 2007. The company confirmed the existence of the project in an interview with Car and Driver on April 13. Engine power levels were confirmed to be between , but contrary to prior rumors of a supercharged 6.2 liter engine, the engine was only confirmed to have greater displacement than the 7.0 liter LS7 in the Z06. Motor Trend confirmed the official name for the production version of the Blue Devil, resurrecting the old ZR1 nameplate. The ZR1 had originally been used on developmental cars in 1971, and again as ZR-1 as the top of the line variant of the C4 Corvette. General Motors officially introduced the Corvette ZR1 on December 19, giving a press release and photographs of the car. GM confirmed a supercharged 6.2 L LS9 V8 having a power output of at 6,500 rpm and of torque at 3,800 rpm. A test of the ZR1 on the German autobahn revealed a top