Built to celebrate Cadillac's 100-year anniversary, the Cien (Spanish for 100) was a mid-engined Supercar.  It was constructed from a composite material called Aerogel, used in the monocoque chassis and inspired by the F-22 Raptor Fighter Aircraft.  

Power came from a Cadillac V12 that displaced 7.5 liters in size — an enlarged version of the production Northstar V8.  The 750-horsepower engine was coupled with a paddle-shifted six-speed transmission, an automatic in Cadillac tradition.  

A unique feature was the use of night vision suited for situations well beyond the flush-mounted headlights’ reach. While it was strictly intended as a prototype machine to gauge public tastes, had it seen production it would have, without question, outshined Chevrolet's Corvette.