body color-matching stitching. Other improvements include Magnetic Selective Ride Control, a special carbon engine cover, 20-spoke black 19-inch front/20-inch rear wheels, and ZR1's carbon ceramic Brembo brakes. Although Chevrolet planned to sell 500 of the Z06 Carbon Limited Edition, only 252 units were produced. Centennial Edition (2012) Order code "ZLC" was an equipment package celebrating 100 years of racing heritage of Chevrolet. Offered exclusively in Carbon Flash Metallic, the Centennial Edition kit includes satin-black graphics and unique lightweight cast-spun aluminum Centennial Satin Black wheels that feature a thin red perimeter outline (on Z06 and ZR1 cars). All cars came with red brake calipers and featured Magnetic Selective Ride Control. Inside, the car featured ebony leather upholstery and contrast stitching while the steering wheel and armrests featured microfiber suede accents. The headrests have an embossed Centennial Edition logo and the steering wheel hub carries the same "Louis Chevrolet 100" graphic found on the car's B-pillar and wheel center caps. Cadillac XLR The Cadillac XLR is a luxury roadster that was marketed by Cadillac from 2004 to 2009 model years. Assembled in Bowling Green, Kentucky, the XLR was based on the Chevrolet Corvette's Y platform. Designed to be a grand touring offering, the XLR featured different exterior and interior design, standard adaptive suspension system, a 4.6-liter Northstar V8 engine, and a power-retractable aluminum hardtop. Production notes Total: 215,223 units. Concept cars Z06X The Z06X was designed to be a factory built road race car similar to cars like the Porsche 911 GT3 Cup and Dodge Viper ACR-X. The concept car was built by GM with the help of Pratt & Miller Engineering. The Z06X, introduced in 2010, featured racecar components such as: carbon fiber adjustable rear wing, carbon fiber front splitter, full roll cage, fire suppression system, race seat, harness, carbon ceramic brakes, upgraded cooling system, polycarbonate rear window, adjustable coilovers, adjustable sway bars, and tow hooks; the radio, interior carpeting and sound-deadening materials have been removed. The suspension system was designed and supplied by Pfadt Race Engineering. Racing C6.R The C6.R was a replacement for the C5-R, built by Pratt & Miller, and unveiled for its first competition at the 2005 12 Hours of Sebring endurance race of the American Le Mans Series. It came in second and third in its class, just behind the new Aston Martin DBR9 race car. It was put on display a week later at the