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This is no ordinary C4 coupe, but a GM Engineering test mule with VIN plate EX4607 proudly displayed in the windscreen, built in 1986 to test all the new-for-1988 features. This actual car must have spent weeks pounding round the General Motors Proving Ground at Milford, Michigan with longer runs on the road, testing all the changes for a year which saw the C4 suspension, steering and brakes vastly improved.
2013 C6 Chevrolet Corvette ZR1
The 638-hp, 6.2-liter supercharged V-8 LS9 engine features such niceties as titanium connecting rods and intake valves, a forged steel crankshaft, and a dry-sump oil system. The suspension has magnetorheological shocks that enabled Chevrolet engineers to use softer springs than in the conventionally damped Z06. Corvette's top dog model is no joke and an accomplished sports car that puts up a good fight against the world's best.
2009 Chevrolet Corvette ZR1
The ZR-1 returned with the 1990 Corvette lineup after an eighteen year hiatus.  This time, it featured a special LT5 engine that had been developed by Lotus (which, at the time, had been a subsidiary of General Motors.) The LT5 engine featured an all-aluminum block, four overhead camshafts, and 32 valves. It also featured an air management system which enabled the car to maintain proper operation while closing off half of its fuel injection system.
There were several successful attempts to build a convertible ZR-1, most of them by private people. The DR-1 was a GM prototype to test the structural integrity of the ZR-1 chassis when it would be topless. The car was built by American Sunroof Corporation (ASC) for Don Runkle, who was the vice-president of Advanced Engineering Staff, which explains the “DR-1” designation. It was a standard convertible transformed to ZR-1 specs.