The 2000s witnessed a surge of supercar concepts that failed to reach production, as highlighted in a recent issue of evo magazine. This period was characterized by daring designs and innovative concepts, yet many of these vehicles remained unrealized.

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Notable among these concepts were the Audi Rosemeyer, featuring a retro-futuristic design, a W16 engine, and an open-gate manual transmission, and the Cadillac Cien, inspired by the F-22 Raptor. The Cien was seriously considered for production but was ultimately abandoned due to the high costs associated with developing a custom platform.